C-25.1 - Code of Penal Procedure

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75. A peace officer who finds a person committing an offence may arrest him without a warrant if that is the only reasonable means available to him to put an end to the commission of the offence.
The person so arrested must be released from custody by the person detaining him once the latter person has reasonable grounds to believe that detention is no longer necessary to prevent, for the time being, the repetition or continuation of the offence.
1987, c. 96, a. 75.