Phone use records are NOT protected by the 4th Amendment

Ejudicated by the SCOTUS WAAAAAAAAAAAAAAAAAAAAAYYYYYYY back in 1979

U.S. Supreme Court
SMITH v. MARYLAND, 442 U.S. 735 (1979)

The telephone company, at police request, installed at its central offices a pen register to record the numbers dialed from the telephone at petitioner's home. Prior to his robbery trial, petitioner moved to suppress "all fruits derived from" the pen register. The Maryland trial court denied this motion, holding that the warrantless installation of the pen register did not violate the Fourth Amendment. Petitioner was convicted, and the Maryland Court of Appeals affirmed.

Held:

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. Pp. 739-746.

(a) Application of the Fourth Amendment depends on whether the person invoking its protection can claim a "legitimate expectation of privacy" that has been invaded by government action. This inquiry normally embraces two questions: first, whether the individual has exhibited an actual (subjective) expectation of privacy; and second, whether his expectation is one that society is prepared to recognize as "reasonable." Katz v. United States, 389 U.S. 347 . Pp. 739-741.

(b) Petitioner in all probability entertained no actual expectation of privacy in the phone numbers he dialed, and even if he did, his expectation was not "legitimate." First, it is doubtful that telephone users in general have any expectation of privacy regarding the numbers they dial, since they typically know that they must convey phone numbers to the telephone company and that the company has facilities for recording this information and does in fact record it for various legitimate business purposes. And petitioner did not demonstrate an expectation of privacy merely by using his home phone rather than some other phone, since his conduct, although perhaps calculated to keep the contents of his conversation private, was not calculated to preserve the privacy of the number he dialed. Second, even if petitioner did harbor some subjective expectation of privacy, this expectation was not one that society is prepared to recognize as "reasonable." When petitioner voluntarily conveyed numerical information to the phone company and "exposed" that information to its equipment in the normal course of business, he assumed the risk that the company would reveal the information [442 U.S. 735, 736] to the police, cf. United States v. Miller, 425 U.S. 435 . Pp. 741-746.

283 Md. 156, 389 A. 2d 858, affirmed.

BTW, the companies voluntarily shared the info with the government (as it does on a routine basis when they can sell your info to marketing firms and business partners). How that even comes close to some government malfeasance is beyond me.