In the absence of clear guidance, a recent report from the American Civil Liberties Union suggests, law enforcement agencies are making up the rules as they go along, often obtaining location data from cellphone carriers without a warrant even for routine investigations. Last week, a House subcommittee considered a bill that would address this threat to privacy by requiring a warrant for geolocational surveillance, regardless of the method used.
While the Supreme Court's decision involved surveillance that required a trespass on the target's property, five justices seemed to agree the real issue was the sensitive information collected by continually tracking his car for 28 days. As the U.S. Court of Appeals for the D.C. Circuit observed in the same case, "A person who knows all of another's travels can deduce whether he is a weekly churchgoer, a heavy drinker, a regular at the gym, an unfaithful husband, an outpatient receiving medical treatment, an associate of particular individuals or political groups -- and not just one such fact about a person, but all such facts."
Cellphone tracking can be even more revealing, since people take their phones everywhere, including private indoor locations. Furthermore, carriers retain location records for months or years, creating a trove of personal data that law enforcement agencies can peruse at will if there is no requirement for judicial authorization.
"There have always been facets of American life that have been uniquely safeguarded from the intrusive interference and observation of government," the ACLU's Catherine Crump told the House Judiciary Committee's Subcommittee on Crime, Terrorism and Homeland Security last week. "Geolocation surveillance threatens to make even those aspects of life an open book to government."
Crump was testifying in support of the Geolocational Privacy and Surveillance (GPS) Act, a bill introduced by Rep. Jason Chaffetz, R-Utah, that would require the government to obtain a probable-cause warrant before intercepting or demanding geolocation data, except in emergencies and cases involving foreign intelligence.
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