Smith v. Maryland (1978)
- Docket
- 78-5374
- Decided
- 1978-01-01
Summary
Question: Did the use of a pen register without a warrant violate the Fourth Amendment protection against unreasonable searches and seizures? Conclusion: No. Justice Harry A. Blackmun delivered the opinion for the 5-3 majority. The Court held that Fourth Amendment protections are only relevant if the individual believes that the government has infringed on the individual's reasonable expectation of privacy. This reasonable expectation of privacy does not apply to the numbers recorded by a pen register because those numbers are used in the regular conduct of the phone company's business, a fact of which individuals are aware. Because the Fourth Amendment does not apply to information that is voluntarily given to third parties, the telephone numbers that are regularly and voluntarily provided to telephone companies by their customers do not gain Fourth Amendment protections. Justice Potter Stewart wrote a dissent in which he argued that a person who uses a telephone has a reasonable expectation of privacy regarding the content of call. Because the telephone numbers dialed also contain information relating to the content of the call, that information is also protected by the Fourth Amendment. Justice William J. Brennan, Jr. joined in the dissent. In his separate dissent, Justice Thurgood Marshall argued that the majority opinion's analysis depends on an individual's choice to voluntarily turn over information, but that choice is not valid if no practical alternative exists. He wrote that no citizen should be forced to accept government monitoring of the phone numbers he dials simply by registering a phone with a telephone company. Such government intrusion on telephone records could impede the exercise of free speech or political affiliation. Therefore phone records should be subject to the Fourth Amendment's protections. Justice Brennan also joined in the dissent. Justice Lewis F. Powell, Jr. did not participate in the discussion or decision of this case.