Spain ratified the United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances of 1988 on 13 August 1990. Article 3 of the convention requires each party, subject to its constitutional principles, to make the possession, purchase and cultivation of drugs for personal consumption a criminal offence.[1]
Listed for context. No score change is recorded for Spain here.
References
Checked. The date and the event were compared with a source that was read.