A landmark Supreme Court decision came down last Friday: R. v. Spencer.
This case takes Canada away from the past regime where police could request subscriber information corresponding to an IP without a warrant. In earlier lower court decisions judges have relied on ISP terms of service to say that users have no reasonable expectation of privacy. The legal theory was that the contracts users enter into allowed ISPs to disclose information to police so it was permitted. The Supreme Court unanimously rejected this regime and declared such searches "presumptively unreasonable":

