Legal challenges to pervasive computing systems have largely centered on the question of whether using certain systems constitutes a search according to the Fourth Amendment to the US Constitution. The sidebar "Relevant US Supreme Court Decisions" summarizes several key cases relating to privacy and technology, including Katz v. United States (1967), Kyllo v. United States (2001), Silverman v. United States (1961), and United States v. Karo (1984). When a government agency uses a sensing system to collect data, the legal questions often entail whether that Developing a framework for judging pervasive technologies against social norms can give technology developers insight into how and why the systems they create test those norms.
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