What is the test for a warrantless search?

In Debot v. The Queen (1989), 1989 CanLII 13 (SCC), 52 C.C.C. (3d) 193, Wilson J. at p. 214 wrote: The police officer who must have reasonable and probable grounds for believing a suspect is in possession of a controlled drug is the one who decides that the suspect should be searched. That officer may or may not perform the actual search. If another officer conducts the search, he or she is entitled to assume that the officer who ordered the search had reasonable and probable grounds for doing so. And at p. 215 she wrote: In my view, there are at least three concerns to be addressed in weighing evidence relied on by the police to justify a warrantless search. First, was the information predicting the commission of a criminal offence compelling? Secondly, where that information was based on a "tip" originating from a source outside the police, was that source credible? Finally, was the information corroborated by police investigation prior to making the decision to conduct the search? I do not suggest that each of these factors forms a separate test. Rather, I concur with Martin J.A.'s view that the "totality of the circumstances" must meet the standard of reasonableness. Weaknesses in one area may, to some extent, be compensated by strengths in the other two.