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In a 5-4 opinion delivered by Justice Antonin Scalia, the Court held that "[w]here, as here, the Government uses a device that is not in general public use, to explore details of the home that would previously have been unknowable without physical intrusion, the surveillance is a 'search' and is presumptively unreasonable without a warrant." In dissent, Justice John Paul Stevens argued that the "observations were made with a fairly primitive thermal imager that gathered data exposed on the outside of [Kyllo's] home but did not invade any constitutionally protected interest in privacy," and were, thus, "information in the public domain."
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