What is the test for obtaining a search warrant in the early stages of an investigation?

In assessing this issue, some features of the search warrant process bear repeating. First, a search warrant is an investigative evidence gathering tool often used in the early stages of an investigation before the final form of the investigation and the charges, if any, are known; see Canadian Oxy Chemicals v. Canada (Attorney General), supra, at para. 21-22. When obtaining a warrant in the early stages of an investigation, the police are not required to have uniform grounds of belief in relation to all aspects of the investigation. Depending on the state of an investigation, the police may have reasonable and probable grounds in relation to some offences and items of evidence but only suspicion in relation to others.