R v Thomas - [1991] 3 NZLR 141

Criminal law — Offences — Obstruction of police officer acting in execution of duty — Obstruction of a person aiding him — Whether the mens rea requirement is met by proof only of knowledge on the part of the defendant that the police officer is exercising a prima facie legitimate type of police power — Whether s 48 of the Crimes Act is available to defendants charged with obstruction — Summary Offences Act 1981, s 23 - Crimes Act 1961, s 48.