Context not part of the score

Driving

What the law needs to convict a driver who has used cannabis.

Countries convict drivers who have used cannabis in very different ways. Some must prove the driver was impaired; some set a fixed limit of THC in the blood; some punish any detectable trace. Germany, for example, set a limit of 3.5 nanograms per millilitre of blood serum in August 2024, with no cannabis at all for novice drivers. An overview is in drug-impaired driving.^[1]

These sections say what the law needs to convict, and the map sorts countries from an impairment test to a zero-tolerance rule. The difference matters most where cannabis is legal or prescribed, because a driver can be within the drug law and still break the driving rule.

profiles with this section: 162
explained as not applicable: 0
not researched yet: 58
of 220 places covered: 74%

Driving, on the map

Select a country for its section. The interactive map →

Impairment must be shownCapable of affecting drivingFixed THC limitAfter consumptionZero toleranceNot researched yet

Driving: how the 162 researched places divide

58 places have no status yet.

Status	What it means	Places
Drug-driving trigger unverified	Drug-driving rules were reviewed, but no cannabis-specific offence trigger or THC cutoff was established	10
Impairment must be shown	The reviewed driving offence requires evidence of drug influence or impairment; additional offences may apply	97
Capable of affecting driving	A conviction needs the drug in a biological sample and proof it was capable of affecting driving. A driving mistake is outside that proof	1
Fixed THC limit	A set THC level in blood or saliva is an offence by itself, whether or not the driver is impaired	14
After consumption	The statute prohibits driving after drug consumption; this does not establish a laboratory THC cutoff	11
Zero tolerance	Any detectable THC is an offence, however long ago the cannabis was used	29

Country by country

The opening of each profile's section; the country's page has it in full, with sources.

Only places with a section

Country	Driving	What the profile says
AbkhaziaAsia	—	Not researched yet
AfghanistanAsia	Drug-driving trigger unverified	No cannabis-specific driving offence or THC limit was found in the last codified drug law or in the Taliban decrees read. The status is left unverified rather than treating a general traffic rule as a drug-driving offence.
AlbaniaEurope	After consumption	Road Code article 185 prohibits a drug or psychotropic-substance user from driving. Its influence heading does not supply a numerical THC cutoff or a presence-based laboratory rule.
AlgeriaAfrica	Impairment must be shown	Road Code 26-09, promulgated on 12 May 2026 and published on 17 May, replaces Law 01-14. Article 137 provides one to two years and DZD100,000–200,000 for driving, or accompanying a learner, under the influence of narcotics or…
AndorraEurope	Zero tolerance	Driving with drugs in the body is a very serious administrative offence under Traffic Code article 112(k), carrying €201–400 and up to two months’ licence suspension when it is not a crime.
AngolaAfrica	—	Not researched yet
Antigua and BarbudaNorth America	Impairment must be shown	Vehicles and Road Traffic Act section 54 prohibits driving, attempting to drive or being in charge on a road when a drug prevents proper vehicle control. Both the government's older Cap.
ArgentinaSouth America	After consumption	National traffic law prohibits driving after consuming narcotics or medicines that reduce driving ability. Article 48(a) specifies no numerical THC cutoff;
ArmeniaAsia	Zero tolerance	Administrative Offences Code article 126(9) treats a driver as intoxicated when testing shows narcotic or psychotropic substance content in blood or urine.
ArubaNorth America	—	Not researched yet
AustraliaOceania	Zero tolerance	Road law belongs to the states, and the general model is a presence offence: detected THC can be enough without proof of impairment.
AustriaEurope	Impairment must be shown	Driving while impaired by drugs is an offence; there is no numerical THC limit. The government's penalty table lists an €800–3,700 fine, a one-month licence withdrawal and traffic coaching for a first offence.
AzerbaijanAsia	Impairment must be shown	Driving while intoxicated by narcotics, psychotropic substances or other strong substances is an administrative offence under Article 333-1.1: a 600 manat fine or restriction of the right to drive for six to twelve months.
BahamasNorth America	—	Not researched yet
BahrainAsia	Impairment must be shown	Traffic Law article 35 prohibits driving when alcohol or a drug causes loss of control or impaired driving ability, and separately prohibits taking these substances while driving.
BangladeshAsia	After consumption	Road Transport Act section 49(1), first part (a), prohibits a driver from driving after drinking alcohol or consuming intoxicants. This is a consumption-based rule;
BarbadosNorth America	Impairment must be shown	Road Traffic Act section 85 prohibits driving, attempting to drive or being in charge on a road or public place when drug influence makes proper vehicle control impossible.
BelarusEurope	Zero tolerance	Any drug-induced state counts: driving while intoxicated by drugs, or refusing the examination, brings an administrative fine of 200 base values, BYN9,000 at the 2026 base, with a five-year driving ban.
BelgiumEurope	Fixed THC limit	The roadside THC saliva screen uses 25 ng/mL; evidentiary saliva analysis uses 10 ng/mL. Blood analysis, where saliva testing or analysis cannot be performed under article 63, measures THC in plasma at a 1 ng/mL threshold.
BelizeNorth America	Impairment must be shown	Motor Vehicles and Road Traffic Act section 74 defines drug-related unfitness as impaired ability to drive properly.
BeninAfrica	—	Not researched yet
BermudaNorth America	—	Not researched yet
BhutanAsia	Impairment must be shown	Road Safety and Transport Act 1999 section 34 prohibits driving while under the influence of any drug of addiction to an extent that proper control is impossible; the fine is 25 penalty units, or Nu 1,250.
BoliviaSouth America	Impairment must be shown	Traffic Code article 97 prohibits driving under the effects of drugs or other intoxicants, as well as when physical or mental health prevents normal and safe driving.
Bosnia and HerzegovinaEurope	—	Not researched yet
BotswanaAfrica	Impairment must be shown	Road Traffic Act section 46(2) prohibits driving or attempting to drive while unfit through drugs. Section 46(4) provides P5,000–10,000, two–five years in prison, or both; being in charge without driving is a separate offence.
BrazilSouth America	Impairment must be shown	The Traffic Code has two levels. Driving under the influence of alcohol or any other psychoactive substance that causes dependence is a very serious administrative infraction: a fine multiplied by ten and a 12-month suspension of…
British Virgin IslandsNorth America	—	Not researched yet
BruneiAsia	Impairment must be shown	Road Traffic Act section 26 covers driving, attempting to drive or being in charge on a road or public place while drug influence makes proper vehicle control impossible;
BulgariaEurope	Zero tolerance	Driving after using drugs is an offence in itself, with no level set: police use a roadside test for seven drugs, marijuana among them, and a positive result opens criminal proceedings.
Burkina FasoAfrica	—	Not researched yet
BurundiAfrica	—	Not researched yet
Cabo VerdeAfrica	—	Not researched yet
CambodiaAsia	Impairment must be shown	Article 63 punishes driving a road, water or air vehicle under the influence of drugs with one month to one year and an optional 100,000–2,000,000 riel fine;
CameroonAfrica	Impairment must be shown	Article 103 of the drug law punishes driving under the influence of cannabis with the penalties the Penal Code sets for driving while drunk or intoxicated.
CanadaNorth America	Fixed THC limit	Federal criminal law sets fixed blood limits. Between 2 and 5 nanograms of THC per millilitre of blood is a summary offence with a fine of up to 1,000 dollars.
Cayman IslandsNorth America	—	Not researched yet
Central African RepublicAfrica	—	Not researched yet
ChadAfrica	—	Not researched yet
ChileSouth America	Zero tolerance	The Traffic Law makes it a crime to drive under the influence of narcotic or psychotropic substances and, unlike for alcohol, sets no levels.
ChinaAsia	Drug-driving trigger unverified	The Road Traffic Safety Law prohibits driving after taking any state-controlled narcotic or psychotropic drug.
ColombiaSouth America	Impairment must be shown	The 2013 law punishes driving under the influence of alcohol or under the effects of psychoactive substances.
ComorosAfrica	—	Not researched yet
CongoAfrica	—	Not researched yet
Costa RicaNorth America	Impairment must be shown	Penal Code article 261 bis penalises driving under the influence of narcotics, psychotropic drugs or analogous substances affecting the driver.
Côte d'IvoireAfrica	Impairment must be shown	Driving under the influence of a drug consumed illicitly carries one to five years in prison and a fine of 200,000 to 2 million francs. Courts cancel the licence for six months to five years, definitively on repeat offending;
CroatiaEurope	Impairment must be shown	Croatian law sets no THC limit. The road-safety law punishes driving under the influence of drugs and the criminal code covers a driver who is not capable of driving and causes danger, so in both cases impairment is the test.
CubaNorth America	—	Not researched yet
CuraçaoNorth America	—	Not researched yet
CyprusEurope	Impairment must be shown	The traffic law requires impairment and sets no THC limit, but in practice drivers are usually prosecuted under the narcotics law, since using and possessing drugs is a crime in itself and no effect on driving has to be shown.
CzechiaEurope	Fixed THC limit	At 2 ng/ml of delta-9-THC in blood serum, a driver is legally affected under Regulation 41/2014. The Supreme Court's separate threshold of 10 ng/ml in blood serum supports a finding of unfitness to drive for the criminal offence.
DenmarkEurope	Fixed THC limit	Denmark has a fixed limit of 1 nanogram of THC per millilitre of blood, alongside an offence of impaired driving; the rule does not apply to a substance taken in accordance with a medical prescription.
DjiboutiAfrica	—	Not researched yet
DominicaNorth America	Impairment must be shown	Vehicles and Road Traffic Act section 55 covers driving, attempting to drive or being in charge of a motor vehicle on a road when drugs prevent proper control. Unfitness is defined as impaired ability to drive properly.
Dominican RepublicNorth America	Impairment must be shown	Law 63-17 article 257 prohibits driving under the effects of drugs or controlled substances. It specifies a fine of five to ten minimum salaries for the centralised public sector and licence-point deductions determined by…
DR CongoAfrica	—	Not researched yet
EcuadorSouth America	Impairment must be shown	COIP article 384 penalises driving under the effects of narcotic or psychotropic substances with thirty days' deprivation of liberty and deduction of fifteen licence points;
EgyptAfrica	Impairment must be shown	Amendments to the traffic law published in November 2014 made driving under the influence punishable by at least one year in prison. If the driver injures someone the minimum is two years and a fine of 10,000 pounds;
El SalvadorNorth America	—	Not researched yet
Equatorial GuineaAfrica	—	Not researched yet
EritreaAfrica	—	Not researched yet
EstoniaEurope	Zero tolerance	There is no THC limit: a driver in whom a drug is detected is removed from the road and dealt with for the drug-use offence, with a fine of up to 1,200 euros or administrative arrest of up to 30 days.
EswatiniAfrica	Impairment must be shown	Road Traffic Act section 91(1) prohibits driving on a public road, or occupying the driver's seat, while under the influence of a drug having a narcotic effect. Section 122(2) sets a maximum E5,000 fine or four years, or both.
EthiopiaAfrica	After consumption	Article 75 of the 2024 Road Transport Traffic Control Regulation prohibits driving or attempting to drive under the influence of drugs or while taking them, including medication or substances that may diminish driving competence;
Faroe IslandsEurope	Fixed THC limit	Driving with THC above 0.001 mg per kg of blood is prohibited when it was not taken under a lawful prescription.
FijiOceania	Impairment must be shown	Land Transport Act section 102 makes driving or being in charge while drug influence prevents proper vehicle control an offence.
FinlandEurope	Zero tolerance	Under the criminal code a driver commits an offence if a narcotic is found in the blood at all, unless it comes from a medicinal product the person has a right to use; a second provision covers impaired driving.
FranceEurope	Zero tolerance	Driving after using a narcotic is an offence whatever the amount; there is no threshold. Police screen heavily: the road-safety observatory counted about 1.2 million drug screenings in 2024, of which 11.1% were positive.
French PolynesiaOceania	Zero tolerance	Driving after using narcotics is an offence under Code de la route L235-1, with up to three years and a €9,000 fine, six licence points, suspension for up to five years and possible confiscation.
GabonAfrica	—	Not researched yet
GambiaAfrica	Impairment must be shown	Motor Traffic Act section 48(1) prohibits drug-impaired driving, attempting to drive, or being in charge of a motor vehicle on a road, parking place or other public place.
GeorgiaAsia	Impairment must be shown	Criminal Code article 276(1) criminalises driving a motor vehicle under narcotic, psychotropic or new psychoactive substance influence even without a crash.
GermanyEurope	Fixed THC limit	Driving with at least 3.5 ng of THC per millilitre of blood serum is an administrative offence under section 24a, with a statutory fine ceiling of €3,000; combining that level with alcohol has a €5,000 ceiling.
GhanaAfrica	Impairment must be shown	Section 4 of the Road Traffic Act 2004 makes driving or attempting to drive while under the influence of alcohol or drugs, to the point of being incapable of proper control, an offence;
GibraltarEurope	—	Not researched yet
GreeceEurope	Impairment must be shown	Road Traffic Code Law 5209/2025 article 46 prohibits driving under toxic-substance or medication influence.
GreenlandNorth America	—	Not researched yet
GrenadaNorth America	Impairment must be shown	Road Traffic Act section 62 prohibits drug influence that makes a motor driver, would-be driver or person in charge on a road unfit or unable to control the vehicle. Unfitness means impaired ability to drive properly.
GuamOceania	Impairment must be shown	The Safe Streets Act prohibits driving while impaired by cannabis, with a first offence carrying 48 hours to one year in prison and a $1,000–5,000 fine, plus a six-month licence suspension. There is no THC blood limit;
GuatemalaNorth America	—	Not researched yet
GuernseyEurope	—	Not researched yet
GuineaAfrica	—	Not researched yet
Guinea-BissauAfrica	—	Not researched yet
GuyanaSouth America	Impairment must be shown	Drug-influenced driving is an offence under Motor Vehicles and Road Traffic Act section 39. The 2022 amendment increases the first-offence fine minimum to G$200,000 and the repeat minimum to G$300,000;
HaitiNorth America	—	Not researched yet
HondurasNorth America	—	Not researched yet
Hong KongAsia	Zero tolerance	Road Traffic Ordinance section 39K makes it an offence to drive, attempt to drive or be in charge of a vehicle with any concentration of cannabis in blood or urine.
HungaryEurope	Impairment must be shown	The criminal code punishes driving while impaired and sets no THC limit. Police may stop at random and test on suspicion; there is no roadside oral-fluid test, and blood is taken at a police station.
IcelandEurope	Zero tolerance	The Traffic Act forbids driving under the influence of drugs that are banned in Iceland, and says that when such a drug is measured in the driver's blood the driver is deemed under the influence and unfit to drive safely.
IndiaAsia	Impairment must be shown	Section 185 of the Motor Vehicles Act covers driving or attempting to drive while under the influence of a drug to the extent of being incapable of proper vehicle control; it is not a fixed THC blood-limit offence.
IndonesiaAsia	Impairment must be shown	Article 106(1) of Law 22/2009 requires proper driving with full concentration. Its official explanation expressly includes alcohol or drugs affecting driving ability.
IranAsia	Impairment must be shown	Driving after using cannabis is an offence when the police can show intoxication or incapacity from narcotics. Article 10(b) of the 2011 Traffic Violations Law requires officers to use equipment to establish the condition;
IraqAsia	Impairment must be shown	Traffic Law No. 8 of 2019 punishes driving under the influence of alcohol or drugs with three months to one year in prison, a fine of 200,000 to 500,000 dinars, or both.
IrelandEurope	Fixed THC limit	Ireland sets two limits in whole blood, measured within three hours of driving: 1 nanogram of THC per millilitre, and 5 nanograms per millilitre of the metabolite 11-nor-9-carboxy-THC.
Isle of ManEurope	—	Not researched yet
IsraelAsia	Zero tolerance	The Traffic Ordinance makes it an offence to be "intoxicated" while driving or in charge of a vehicle, and defines an intoxicated person to include anyone who has a dangerous drug, or the metabolic products of one, in their body.
ItalyEurope	Impairment must be shown	A 2024 reform renamed the offence from driving in a state of alteration to driving after taking drugs, which was widely read as making a positive test enough.
JamaicaNorth America	Impairment must be shown	The Road Traffic Act 2018 makes drug influence that prevents proper vehicle control an offence when driving, attempting to drive or being in charge on a road or public place.
JapanAsia	Impairment must be shown	The Road Traffic Act forbids driving when normal driving may not be possible because of drugs, illness, overwork or another reason. The law sets no THC level; the test is the driver's condition.
JerseyEurope	—	Not researched yet
JordanAsia	Impairment must be shown	The amended Traffic Law No. 18 of 2023, in force from 12 September 2023, punishes driving under the influence of alcohol or drugs with one to three months in prison, a fine of 250 to 500 dinars, or both, as the judge decides;
KazakhstanAsia	Impairment must be shown	The Code of Administrative Offences punishes driving "in a state of alcoholic, narcotic or toxic intoxication" with 15 days of administrative arrest and loss of the licence for seven years; where harm or damage results, 20 days.
KenyaAfrica	Drug-driving trigger unverified	The Traffic Act makes it an offence to drive, attempt to drive or be in charge of a vehicle while under the influence of an alcoholic drink or a drug 'beyond the prescribed limits'.
KiribatiOceania	Zero tolerance	The Traffic Act prohibits drug-influenced driving of any vehicle, including a bicycle, and deems influence established when a saliva test shows drugs in the driver’s system.
KosovoEurope	Zero tolerance	Road Traffic Law 08/L-186 article 232 prohibits driving under narcotic or other prohibited-drug influence. Article 234(3) confirms drugs in the body through appropriate equipment, medical examination or blood and urine analysis;
KuwaitAsia	Impairment must be shown	The 2025 amended Traffic Law article 38 prohibits driving or attempting to drive under the influence of narcotics, psychotropic substances and other listed substances affecting normal faculties.
KyrgyzstanAsia	Impairment must be shown	Code of Offences article 193(1) punishes driving while intoxicated by alcohol, narcotics, psychotropic or other intoxicating substances with a fine of 800 calculated units, or 80,000 som, and a two-year licence ban.
LaosAsia	Drug-driving trigger unverified	No cannabis-specific driving offence, THC blood or saliva limit, or medical-patient exception was located in the Penal Code or the sources reviewed.
LatviaEurope	Impairment must be shown	Criminal Law section 262(1¹) makes it a crime to drive a vehicle, or to instruct a learner, while under the influence of narcotic, psychotropic, toxic or other intoxicating substances.
LebanonAsia	Impairment must be shown	Article 143 punishes driving a land vehicle under the influence of an illegally used highly dangerous narcotic with three months to two years and LBP 2–5 million;
LesothoAfrica	Impairment must be shown	Road Traffic Act section 92 makes it an offence to drive or attempt to drive on a public road while drink or a drug makes the driver incapable of proper control.
LiberiaAfrica	Impairment must be shown	The government-published Vehicle and Traffic Law section 10.90 prohibits operating a motor vehicle when alcohol or a narcotic drug impairs driving ability, and covers non-narcotic drugs causing dizziness or inability to drive…
LibyaAfrica	Impairment must be shown	Traffic Law 11 of 1984, article 58, punishes driving a vehicle, cart or bicycle while intoxicated or narcotised with one to three years in prison, withdrawal of the licence for one to three years, and confiscation of the…
LiechtensteinEurope	Fixed THC limit	Traffic Regulations article 2(2a) treats inability to drive as established when blood THC is at least 1.5 micrograms per litre (1.5 ng/mL).
LithuaniaEurope	Zero tolerance	No THC limit is set; the administrative offence is committed if a drug is detected. Police may stop at random and test on suspicion, there is no roadside oral-fluid test, and blood or urine is taken at a hospital.
LuxembourgEurope	Fixed THC limit	A THC concentration of 1 ng/mL or more in blood serum is a drug-driving offence under the amended road-traffic law.
MacauAsia	Impairment must be shown	Road Traffic Law 3/2007, article 90(2), punishes driving under the influence of narcotics or psychotropics whose consumption is a crime with up to one year in prison and a one-to-three year driving ban.
MadagascarAfrica	Drug-driving trigger unverified	Article 141 requires drivers to submit to drug screening, and refusal is punished on the personal-use scale; penalties double where the offence causes involuntary homicide or injury.
MalawiAfrica	Impairment must be shown	Road Traffic Act section 128 prohibits driving on a public road under the influence of a drug having a narcotic effect.
MalaysiaAsia	Impairment must be shown	Road Transport Act section 44 covers drug influence that makes the driver incapable of proper control and causes injury or death.
MaldivesAsia	—	Not researched yet
MaliAfrica	—	Not researched yet
MaltaEurope	Fixed THC limit	A law in force since 10 March 2026 sets a permitted level of 2 microgrammes of THC per litre of blood for ordinary drivers.
Marshall IslandsOceania	—	Not researched yet
MauritaniaAfrica	Impairment must be shown	The road code, Ordinance 2006-047, article 10(2), prohibits driving under the influence of substances capable of reducing physical or mental capacity, with 11 days to three months and a 6,000–40,000 ouguiya fine, or one only.
MauritiusAfrica	Zero tolerance	The Road Traffic Act's drug schedule lists delta-9-THC (cannabis) among drugs with zero tolerance, separately from medicines with specified blood limits.
MexicoNorth America	After consumption	The rule shown here applies to federal highways and bridges; state and municipal traffic rules require separate checks.
MicronesiaOceania	Impairment must be shown	Rules are state-specific. Pohnpei section 71 PC 12-105 prohibits driving when drug influence makes safe driving impossible, with up to one year, $500 or both in the 2012 edition.
MoldovaEurope	—	Not researched yet
MonacoEurope	After consumption	Driving after using a substance classified as a narcotic carries one month to two years in prison and €2,250–9,000, or either penalty alone.
MongoliaAsia	Impairment must be shown	The Law on Infringement punishes driving while intoxicated with a one-year licence suspension and a MNT 400,000 fine, or 7–30 days' detention; refusing the test carries the same penalty.
MontenegroEurope	Zero tolerance	Road Safety Law article 182 prohibits driving under narcotic or other psychoactive influence and deems that influence established by a test detecting the substance in the body.
MoroccoAfrica	Impairment must be shown	The government's July 2024 consolidation of Road Code 52-05, article 183, prohibits driving under the influence of narcotics or certain medicines after which driving is forbidden.
MozambiqueAfrica	—	Not researched yet
MyanmarAsia	Impairment must be shown	The Road Safety and Motor Vehicle Management Law 2020 prohibits driving under the influence of narcotic or psychotropic substances, with up to one month in prison or a 100,000 kyat fine, or both;
NamibiaAfrica	Impairment must be shown	The published Road Traffic and Transport Act section 82(1) prohibits driving a vehicle on a public road while under the influence of a drug having a narcotic effect.
NauruOceania	Impairment must be shown	Driving under the influence of a drug is an offence under Motor Traffic Act section 69(1). The official Service 6 consolidation retains that drug limb, and section 114 permits arrest without warrant on reasonable cause for a…
NepalAsia	Drug-driving trigger unverified	The Narcotic Drugs (Control) Act contains no driving offence, and the sources read did not identify a cannabis-specific traffic rule or THC limit.
NetherlandsEurope	Fixed THC limit	The Netherlands has had fixed limits since a 2016 decree: 3 nanograms of THC per millilitre of blood, falling to 1 when cannabis is combined with alcohol, alongside the older offence of impaired driving.
New ZealandOceania	Fixed THC limit	Police can stop any driver and screen saliva at the roadside for four drugs, THC among them. Testing began in Wellington on 15 December 2025, with a national roll-out planned from April 2026.
NicaraguaNorth America	—	Not researched yet
NigerAfrica	—	Not researched yet
NigeriaAfrica	Impairment must be shown	Section 22 of the Federal Road Safety Commission Act prohibits driving on a highway under the influence of intoxicating drugs, including inability to maintain proper control of the vehicle.
North KoreaAsia	—	Not researched yet
North MacedoniaEurope	Impairment must be shown	Drug-related inability to drive safely can lead to immediate removal from traffic and temporary licence withdrawal under Road Safety Law article 341.
Northern CyprusEurope	—	Not researched yet
Northern Mariana IslandsOceania	Impairment must be shown	Driving under the influence of any drug that makes safe driving impossible is an offence under 9 CMC sections 7105 and 7109, with 72 hours to one year and a $500–1,000 fine on a first conviction, plus a 30-day to six-month…
NorwayEurope	Fixed THC limit	Norway sets graded limits for THC of 1.3, 3 and 9 nanograms per millilitre of blood, meant to match the national blood-alcohol steps, together with a general impairment offence.
OmanAsia	Impairment must be shown	The amended Traffic Law article 50 bis prohibits driving on a road under the influence of alcohol, a narcotic or another psychotropic substance. The police-published text provides one to six months’ imprisonment and OMR400–800;
PakistanAsia	Impairment must be shown	The Provincial Motor Vehicles Ordinance's section 100 prohibits driving or attempting to drive while drink or drugs prevent proper vehicle control.
PalauOceania	Drug-driving trigger unverified	42 PNC section 514 prohibits driving under the influence of "narcotic drugs", but the controlled-substances definition limits "narcotic drug" to opium and coca derivatives, and a 1974 Trust Territory case held that marijuana is…
PalestineAsia	Impairment must be shown	West Bank article 17(4)(b) raises the minimum to two years or a 2,000–5,000 dinar fine for driving under the influence. There is no THC limit; the trigger is impairment.
PanamaNorth America	Impairment must be shown	Traffic Regulation articles 142–143 prohibit driving under the effects of narcotics and provide for licence retention and removal of the vehicle when intoxication is established.
Papua New GuineaOceania	Impairment must be shown	Road Traffic Act section 42 criminalises driving on a public street under the influence of alcohol or a drug, including occupying the driving seat and trying to put the vehicle in motion.
ParaguaySouth America	After consumption	National Traffic Law article 66(a), as amended by Law 6868, prohibits driving after consuming narcotics or medicines that diminish driving aptitude, whatever the concentration per litre of blood.
PeruSouth America	Impairment must be shown	The Penal Code punishes driving 'under the effect of' toxic drugs, narcotics or psychotropic substances with six months to two years in prison, or 52 to 104 days of community service, and disqualification.
PhilippinesAsia	Zero tolerance	The Anti-Drunk and Drugged Driving Act defines drugged driving by a positive confirmatory test for dangerous-drug use, without a numerical THC allowance, a separate requirement to prove impairment, or a medical exception.
PolandEurope	After consumption	Poland sets no laboratory THC limit. Driving after using a substance that acts like alcohol is a misdemeanour under article 87 of the Code of Petty Offences: arrest or a fine of at least 2,500 zlotys, and a driving ban.
PortugalEurope	Impairment must be shown	Driving under the influence of a psychotropic substance is forbidden. A driver is under that influence when an examination under the road code, and the rules that complement it, says so in a medical or expert report.
Puerto RicoNorth America	—	Not researched yet
QatarAsia	Impairment must be shown	Traffic Law article 57(2) prohibits driving under the influence of alcohol, drugs or other psychotropic substances.
RéunionAfrica	—	Not researched yet
RomaniaEurope	Capable of affecting driving	Driving a vehicle that needs a licence, while under the influence of a psychoactive substance, carries one to five years in prison and a ban on exercising rights.
RussiaEurope	Zero tolerance	The Code of Administrative Offences punishes driving in a state of intoxication with a fine of 45,000 roubles and loss of the licence for one and a half to two years, where the act is not a crime.
RwandaAfrica	—	Not researched yet
Saint Kitts and NevisNorth America	Impairment must be shown	Vehicles and Road Traffic Act section 40 prohibits drug influence that makes proper control impossible while driving, attempting to drive or being in charge on a road.
Saint LuciaNorth America	Impairment must be shown	Motor Vehicles and Road Traffic Act section 75 defines drug intoxication as impairment making the driver incapable of proper control.
Saint Vincent and the GrenadinesNorth America	—	Not researched yet
SamoaOceania	Impairment must be shown	Road Traffic Ordinance section 40(3) prohibits driving or attempting to drive when alcohol, one or more drugs, or their combination makes proper vehicle control impossible.
San MarinoEurope	Impairment must be shown	Driving with psychophysical impairment caused by drugs or medication abuse is criminal under Road Code article 57.
São Tomé and PríncipeAfrica	—	Not researched yet
Saudi ArabiaAsia	Impairment must be shown	Traffic Law article 68 treats driving under the influence of alcohol, drugs or warned prescription medicines as an offence.
SenegalAfrica	—	Not researched yet
SerbiaEurope	Zero tolerance	The Road Traffic Safety Law forbids driving under the effect of psychoactive substances, and defines that state as the presence of such substances in the body, established by a test.
SeychellesAfrica	Impairment must be shown	Road Transport Act section 24(1)(c) makes it an offence to drive or be in charge of a vehicle on a road or public place when drugs cause unfitness to drive. Section 24(5) defines unfitness as impaired ability to drive properly;
Sierra LeoneAfrica	Impairment must be shown	Road Traffic Act section 102 prohibits driving or attempting to drive on a road while alcohol or drugs make proper control of the vehicle impossible.
SingaporeAsia	Impairment must be shown	The Road Traffic Act makes it an offence to drive while unfit, meaning under the influence of drink, a drug or a psychoactive substance to such an extent as to be incapable of having proper control of the vehicle.
Sint MaartenNorth America	—	Not researched yet
SlovakiaEurope	Zero tolerance	The road law prohibits driving while a drug can still be present in the body, with no numerical THC allowance. Driving while impaired to the point of being unfit carries up to one year in prison under the Criminal Code;
SloveniaEurope	Zero tolerance	No THC limit is set: the offence is committed if a drug is detected. Police may stop at random and test on suspicion, with a roadside oral-fluid test and blood or urine taken at a hospital.
Solomon IslandsOceania	Impairment must be shown	Road Transport Act section 43 makes driving or attempting to drive on a road or public place while unfit through drugs an offence; unfitness means impaired ability to drive properly.
SomaliaAfrica	—	Not researched yet
SomalilandAfrica	—	Not researched yet
South AfricaAfrica	Impairment must be shown	There is no THC limit for drivers. The road traffic law prohibits driving under the influence of alcohol or of a drug having a narcotic effect, so a prosecution depends on showing impairment.
South KoreaAsia	Impairment must be shown	The Road Traffic Act punishes driving when normal driving is difficult because of drugs, which include narcotics, psychotropics and cannabis.
South SudanAfrica	—	Not researched yet
SpainEurope	Zero tolerance	Article 14 of the road traffic law forbids driving with drugs in the body. No impairment has to be shown and no threshold applies. The fine is 1,000 euros and six licence points.
Sri LankaAsia	After consumption	Motor Traffic Act section 151 prohibits driving on a road after consuming alcohol or any drug. A suspected driver can be examined by a Government medical officer, and refusal of the examination creates a rebuttable presumption of…
SudanAfrica	—	Not researched yet
SurinameSouth America	—	Not researched yet
SwedenEurope	Zero tolerance	No THC limit is set: the offence is committed if a drug is detected, though there is no liability where it was taken in accordance with a medical prescription. Police may stop at random and test on suspicion;
SwitzerlandEurope	Zero tolerance	The analytical legal THC threshold is 1.5 ng/mL (1.5 micrograms per litre) in whole blood; it is not a scientific impairment threshold.
SyriaAsia	Drug-driving trigger unverified	No cannabis-specific driving offence or THC limit was verified. The traffic law is Law 31 of 2004 as amended in 2008, and a replacement was being drafted in October 2026.
TaiwanAsia	After consumption	The Road Traffic Management and Penalty Act punishes a driver found by a test to have taken drugs with the maximum statutory fine: NT$120,000 for a motorcycle and NT$150,000 for a car, with the vehicle impounded and the licence…
TajikistanAsia	—	Not researched yet
TanzaniaAfrica	Impairment must be shown	On the mainland, the Road Traffic Act's 2023 revised edition section 53 prohibits driving, attempting to drive or being in charge on a road or public place while drugs make proper control impossible.
ThailandAsia	Impairment must be shown	The Land Traffic Act punishes driving while impaired by alcohol or another intoxicant, including cannabis, with up to one year and a 5,000 to 20,000 baht fine, plus licence suspension.
Timor-LesteAsia	Impairment must be shown	Penal Code article 208(2) punishes driving while unfit because of narcotics or psychotropic substances with up to two years or a fine, and article 88 allows a licence suspension of three months to two years.
TogoAfrica	Impairment must be shown	Driving under the influence of a high-risk drug used illicitly carries one to three years in prison and a fine of 1 to 3 million francs; refusing screening carries the same.
TongaOceania	Drug-driving trigger unverified	The Traffic Act 2020 has an alcohol-only drug-driving regime: breath testing and offences for driving under the influence of drink, with no drug-specific offence, THC limit or roadside drug test for motor vehicles.
TransnistriaEurope	After consumption	Operating any motor vehicle while intoxicated by narcotic substances is prohibited under Article 12.8 of the Administrative Offences Code.
Trinidad and TobagoNorth America	Impairment must be shown	Motor Vehicles and Road Traffic Act section 70 prohibits driving, attempting to drive or being in charge on a road while drug influence prevents proper vehicle control.
TunisiaAfrica	Drug-driving trigger unverified	No cannabis-specific driving offence or THC limit was confirmed. The road code's drug provision as consolidated covers alcohol, and in July 2025 the National Road Safety Observatory announced rapid saliva tests without a start…
TürkiyeAsia	Zero tolerance	The Highway Traffic Law forbids anyone who has taken narcotic or stimulant substances from driving, with no level set; police use roadside test kits, and a driver who objects is taken for a blood, saliva or urine sample.
TurkmenistanAsia	—	Not researched yet
TuvaluOceania	Impairment must be shown	Driving, attempting to drive or being in charge of a vehicle while a drug impairs driving efficiency carries a $200 fine and one year’s imprisonment.
UgandaAfrica	Impairment must be shown	Section 112 of the Traffic and Road Safety Act prohibits driving or attempting to drive under drug influence. It expressly includes pharmaceutical and prescribed drugs, with no numerical THC allowance stated.
UkraineEurope	Impairment must be shown	Administrative Code article 130(1) covers driving in a state of drug intoxication and refusal of the prescribed examination.
United Arab EmiratesAsia	Impairment must be shown	Federal Decree-Law No. 14 of 2024 on traffic regulation, in force from 29 March 2025, makes it an offence to drive or attempt to drive a vehicle while under the influence of narcotic or psychotropic substances.
United KingdomEurope	Fixed THC limit	The THC limit is 2 micrograms per litre of whole blood in England and Wales and, since 21 October 2019, Scotland. Exceeding the limit can be an offence without proof of impaired driving.
United StatesNorth America	Impairment must be shown	Driving law is set by each state, and most have no THC-specific rule, so a conviction needs evidence of impairment.
UruguaySouth America	Zero tolerance	The regulating decree treats a driver's capacity as impaired whenever THC is detected in the body; it sets no numerical threshold.
US Virgin IslandsNorth America	—	Not researched yet
UzbekistanAsia	Impairment must be shown	The Code of Administrative Responsibility punishes driving in a state of alcoholic intoxication or under the influence of narcotic drugs, psychotropic substances or other substances that affect a person's mental and volitional…
VanuatuOceania	Impairment must be shown	Road Traffic (Control) Act section 16 prohibits driving on a road when a drug or alcohol makes proper vehicle control impossible, and permits arrest without a warrant.
VenezuelaSouth America	Impairment must be shown	Article 139 of the drug law and article 169 of the traffic law sanction driving under the influence of alcohol or other substances, but a study of Venezuelan university students found very few mechanisms for monitoring or…
VietnamAsia	Zero tolerance	Driving with narcotic drugs or other legally prohibited stimulants in the body is an offence, without a quantified THC allowance in the cited provisions.
YemenAsia	Impairment must be shown	Traffic Law 46 of 1991, article 58, punishes driving under the influence of alcohol or drugs with up to two years, a fine of up to 6,500 rials, or both; the court may suspend or withdraw the licence.
ZambiaAfrica	Impairment must be shown	Road Traffic Act section 157 prohibits driving or attempting to drive on a road when intoxicating liquor or narcotic drugs make proper vehicle control impossible.
ZimbabweAfrica	Impairment must be shown	Road Traffic Act section 55(2) prohibits driving or attempting to drive on a road when drugs, alcohol or their combination prevent proper vehicle control.

References

Wikipedia — Drug-impaired driving