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This holding predates by several months the more famous case of Katz v. United States, which extended Fourth Amendment protection to a conversation in a public phone booth based on the speaker's reasonable expectation of privacy.
The Supreme Court has also ruled that there is no objectively reasonable expectation of privacy (and thus no search) when officers hovering in a helicopter 400 feet above a suspect's house conduct surveillance.
Warrantless wiretapping can sometimes be justified under section 1 of the Charter'' in cases where exigent circumstances exist; however the Supreme Court of Canada found in R. v. Tse, 2012 SCC 16 that when police use such tactics, they must promptly notify the individual whose reasonable expectation of privacy has been infringed.