Plaintiff M96A/2016 v Commonwealth of Australia

Migration – Unlawful non-citizens – Power to detain – Where plaintiffs unauthorised maritime arrivals – Where plaintiffs brought to Australia from regional processing country for temporary purpose of medical treatment – Where plaintiffs detained under ss 189 and 196 of Migration Act 1958 (Cth) until removal from Australia – Whether ss 189 and 196 validly authorise detention while in Australia for temporary purpose – Whether plaintiffs detained for lawful purpose – Whether duration of detention capable of objective determination.

Words and phrases – "detention of non-citizen", "duration of detention", "opinion, satisfaction or belief of officer", "purpose of detention", "temporary purpose", "transitory person", "unauthorised maritime arrival", "unlawful non-citizen".

Constitution – s 51(xix).

Migration Act 1958 (Cth) – ss 189, 196, 198, 198AD, 198AH, 198B.