Law 4428 centralised imports and exports of opium, morphine, cocaine, heroin and their salts and derivatives through Callao, with health-authority supervision, registration and prescription controls. Its listed substances did not name cannabis. The original bears the executive date 26 November 1921, after congressional passage on 21 November.[1][2]
Listed for context. No score change is recorded for Peru here.
References
- Ley No. 4428Congress of Peru · 1921 · Original scan, pp. 1–2; Articles 1–10 and legislative/executive datesarchived
- Víctor Prado Saldarriaga — Política criminal nacional, tráfico ilícito de drogas y tratamiento penal de los actos de cultivo de plantas fiscalizadasarchived
Checked. The date and the event were compared with a source that was read.