An arrest is not rendered unlawful merely because the police were mistaken about the precise words used by the person arrested, provided they had reasonable grounds to believe an offence was being committed. Under s 127(3)(a) of the Police Administration Act (NT), the obligation to inform a person of the offence for which they are arrested does not apply where the circumstances are such that the person ought to have known the substance of the offence; this is an objective test assessed by reference to the circumstances of the arrest. Assaulting police in the execution of their duty invites a gaol sentence, particularly where the offender has prior convictions for similar offending.
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