Extradition — Rule of speciality — Absence of treaty — Australia and Canada entering into extradition arrangement incorporating rule of speciality — Extradition on narcotic charges — Whether applicant could be detained on any charge other than that for which he was extradited — Extradition (Commonwealth Countries) Act 1966 (Australia) — Extradition Act, RSC 1970, c. E-21 — The law of Canada