Treaties — Interpretation — Principles of interpretation — Definition of narcotic drugs — Whether including amphetamines — Single Convention on Narcotic Drugs, 1961 — Vienna Convention on Narcotic Drugs, 1971

Treaties — Effect in municipal law — Entry into force — Requirement of prior publication in State official journal — Whether publication of complete text required — Whether annexes require publication

Human rights — Criminal penalty — Prohibition of retroactive criminal legislation — Whether extension of categories of narcotic drugs by international treaty may be given retroactive effect

Relationship of international law and municipal law — Treaties — Incorporation into municipal law — Requirement of publication in entirety in State official journal — The law of Spain