Case: Olmstead v. United States

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…things. They wished to protect the beliefs, thoughts, and emotions of the individual, to ultimately protect his privacy, his right to be alone, the value most highly kept by civilized men. Hence any intrusion upon that privacy is subject to the 4th amendment protections. [Government cannot be allowed to commit crimes in order to apprehend the private criminal. Crime is contagious. If the government breaks the law, it breeds a general contempt for the law.]