R. v. Storrey [1990] 1 S.C.R. 241 is a leading decision of the Supreme Court of Canada

Supreme Court of Canada

The Supreme Court of Canada is the highest court of Canada and is the final court of appeals in the Canadian justice system. The court grants permission to between 40 and 75 litigants each year to appeal decisions rendered by provincial, territorial and federal appellate courts, and its decisions...

on the authority of police officers to make an arrest. The Court added an additional requirement that, in addition to an officer's subjective belief that there are reasonable and probable grounds for arrest, the grounds must be justifiable from an objective point of view.

In his judgement, Cory J. stated:

...the Criminal Code requires that an arresting officer must subjectively have reasonable and probable grounds on which to base the arrest. Those grounds must, in addition, be justifiable from an objective point of view. That is to say, a reasonable person placed in the position of the officer must be able to conclude that there were indeed reasonable and probable grounds for the arrest. On the other hand, the police need not demonstrate anything more than reasonable and probable grounds. Specifically they are not required to establish a prima facie case for conviction before making the arrest.