The Full Wiki

More info on Smith v. Maryland

Smith v. Maryland: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

Smith v. Maryland
Seal of the United States Supreme Court.svg
Supreme Court of the United States
Argued March 28, 1979
Decided June 20, 1979
Full case name Michael Lee Smith v. Maryland
Citations 442 U.S. 735 (more)
99 S. Ct. 2577; 61 L. Ed. 2d 220; 1979 U.S. LEXIS 134
Prior history Cert. to the Court of Appeals of Maryland
Court membership
Case opinions
Majority Blackmun, joined by Burger, White, Rehnquist, Stevens
Dissent Stewart, joined by Brennan
Dissent Marshall, joined by Brennan
Powell took no part in the consideration or decision of the case.

Smith v. Maryland, 442 U.S. 735 (1979)[1], was a case in which the Supreme Court of the United States held that the installation and use of the pen register was not a "search" within the meaning of the Fourth Amendment, and hence no warrant was required. The pen register was installed on telephone company property at the telephone company's central offices. In the Majority opinion, Justice Blackmun rejected the idea that the installation and use of a pen registry constitutes a violation of the "legitimate expectation of privacy" since the numbers would be available to and recorded by the phone company anyways.


In Katz v. United States (1967), the United States Supreme Court established its "reasonable expectation of privacy" test. It overturned Olmstead v. United States and held that wiretaps were unconstitutional searches, because there was a reasonable expectation that the communication would be private. The government was then required to get a warrant to execute a wiretap.

In Smith v. Maryland, the Supreme Court held that a pen register is not a search because the "petitioner voluntarily conveyed numerical information to the telephone company." Since the defendant had disclosed the dialed numbers to the telephone company so they could connect his call, he did not have a reasonable expectation of privacy in the numbers he dialed. The court did not distinguish between disclosing the numbers to a human operator or just the automatic equipment used by the telephone company.

The Smith decision left pen registers completely outside constitutional protection. If there was to be any privacy protection, it would have to be enacted by Congress as statutory privacy law.

See also


  1. ^ 442 U.S. 735 Full text of the opinion courtesy of


Got something to say? Make a comment.
Your name
Your email address