What is the legal test for search and seizure of personal data under s. 8 of the Charter?

In Hunter v. Southam, Dickson J. concluded that in a criminal case a high standard must be met before the state may invade a person's realm of privacy in order to detect and prevent crimes. He expressed the standard this way (at p.168): In cases like the present, reasonable and probable grounds, established upon oath, to believe that an offence has been committed and that there is evidence to be found at the place of the search, constitutes the minimum standard, consistent with s. 8 of the Charter for authorizing search and seizure.