What is the test for a search warrant to search a house for illegal activity?

In R v. Carrier, supra the court was persuaded that there were reasonable grounds to believe that a crime had been committed and as a result found that the search warrant was valid. The court indicated that the details provided in the Information to Obtain were sufficient to provide reasonable grounds. The police left out several details and left certain issues to inference. The court mentioned that the source had observed the information first-hand. The source observed potted plants and lights on in rooms that did not contain furniture. There was no indication in the warrant about the reliability of the source and this was the first time this police officer had dealings with the source. The police also included a comparison of the electricity utilized in the searched location with another nearby home which indicated that its electricity consumption was double the house beside it. The court found that this provided ample evidence and that the provincial court judge acted reasonably when drawing inferences from the information provided.