CHAPTER 7
ARREST
Manner and effect of arrest
41. (2) The person effecting an arrest must, at the time of effecting the arrest or immediately thereafter, inform the arrested person of the cause of the arrest or, in the case of an arrest effected by virtue of a warrant, on demand of the person arrested, hand that person a copy of the warrant.
Fair trial standards
Rights during investigation - informed of belief that crime has been committed
EDIT.