The Supreme Court of Canada just released its decision in R. v. Vu, 2013 SCC 60. The issue under appeal was whether police could search a computer that was seized pursuant to a warrant that did not specifically authorize the search of the computer.
I haven't had a chance to read the entire decision (the electrons are still warm), but the summary in the headnote is very interesting:
The traditional legal framework holds that once police obtain a warrant to search a place for certain things, they do not require specific, prior authorization to search in receptacles such as cupboards and filing cabinets. The question in this case is whether this framework is appropriate for computer searches. Computers differ in important ways from the receptacles governed by the traditional framework and computer searches give rise to particular privacy concerns that are not sufficiently addressed by that approach.
... The second issue is whether the warrant authorized the search of the computers and cellular phone. Section 8 of the Charter — which gives everyone the right to be free of unreasonable searches and seizures — seeks to strike an appropriate balance between the right to be free of state interference and the legitimate needs of law enforcement. This balance is generally achieved in two main ways. First, the police must obtain judicial authorization for a search before they conduct it, usually in the form of a search warrant. Second, an authorized search must be conducted in a reasonable manner, ensuring that the search is no more intrusive than is reasonably necessary to achieve its objectives. The privacy interests implicated by computer searches are markedly different from those at stake in searches of receptacles such as cupboards and filing cabinets. It is difficult to imagine a more intrusive invasion of privacy than the search of a personal or home computer. Computers potentially give police access to an almost unlimited universe of information that users cannot control, that they may not even be aware of, may have tried to erase and which may not be, in any meaningful sense, located in the place of search. The numerous and striking differences between computers and traditional receptacles call for distinctive treatment under s. 8 of the Charter. The animating assumption of the traditional rule — that if the search of a place is justified, so is the search of receptacles found within it — simply cannot apply with respect to computer searches.
In effect, the privacy interests at stake when computers are searched require that those devices be treated, to a certain extent, as a separate place. Prior authorization of searches is a cornerstone of our search and seizure law. The purpose of the prior authorization process is to balance the privacy interest of the individual against the interest of the state in investigating criminal activity before the state intrusion occurs. Only a specific, prior authorization to search a computer found in the place of search ensures that the authorizing justice has considered the full range of the distinctive privacy concerns raised by computer searches and, having done so, has decided that this threshold has been reached in the circumstances of a particular proposed search. This means that if police intend to search any computers found within a place they want to search, they must first satisfy the authorizing justice that they have reasonable grounds to believe that any computers they discover will contain the things they are looking for. If police come across a computer in the course of a search and their warrant does not provide specific authorization to search computers, they may seize the computer, and do what is necessary to ensure the integrity of the data. If they wish to search the data, however, they must obtain a separate warrant. In this case, the authorizing justice was not required to impose a search protocol in advance with conditions limiting the manner of the search. While such conditions may be appropriate in some cases, they are not, as a general rule, constitutionally required. [emphasis added]