The court said a constitutional protection against unreasonable search and seizure was necessary and that warrantless searches should be regarded as presumptively unreasonable.
Canadian government and police agencies have long been involved in trying to coerce telecommunications companies into providing private information about customers, often without a warrant.
Customer information requests from government and police agencies have been increasing steadily.
The information led to the arrest of a man who was found to be in possession of child pornographic material.
He was charged in 2007 and convicted of possession of child pornography.
However, he appealed his conviction, arguing that the search had been unconstitutional and his rights had been violated.
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