What is the test for obtaining a search warrant for marihuana plants based on an anonymous "Crime Stoppers" tip?

In R v. Plant, 1993 CanLII 70 (SCC), [1993] 3 S.C.R. 281, the information in the warrant was found to be sufficiently detailed to corroborate the information provided by the unproven source. An anonymous “Crime Stoppers” tip was received which indicated that marihuana was being grown in the basement of a ‘cute’ house beside a house with a lot of windows on 26th Street between two consecutive cross avenues in Calgary. A police officer went to the area and subsequently ascertained the exact address. Two police officers did a perimeter search. A police officer then checked the utilities and compared the usage and found that the location had consumption four times that of the average house in the area. The court excised the information from the unlawful perimeter search but found that the remaining information was sufficient to constitute reasonable grounds for the warrant.