American Civil Liberties Union

In a recent post I pointed out various ways that license plate recognition devices could be combined with other databases to invade privacy.

One obvious use for ALPR that I did not mention is speeding tickets. If you’ve gotten from point A to point B in less time than would be possible at the speed limit, it would be simple to have the system automatically spit you out a citation. Surveillance drones could also be used for traffic enforcement.

Even after January's landmark Supreme Court decision cast significant doubt on the government’s ability to electronically track a person’s location without a warrant, the Justice Department continues to defend this practice. On Friday, the ACLU, along with the Electronic Frontier Foundation, the Center for Democracy and Technology, and the National Association of Criminal Defense Lawyers, filed a friend-of-the-court brief in the U.S. Court of Appeals for the Fifth Circuit, arguing that the government should be required to obtain a warrant based on probable cause before seizing 60 days’ worth of location information generated by an individual’s cell phone.

Tomorrow, the Department of Justice will tell a federal appeals court panel in New Orleans that law enforcement agents should be permitted to obtain two month’s worth of historical cell phone location information without a warrant. Several civil liberties groups, including the ACLU, have filed briefs arguing otherwise (you can read our amicus brief here). We believe that cell phone location data, particularly when collected over a lengthy period of time, reveals intimate facts about a person's private life. The appropriate legal standard for such private information should be a probable cause warrant, issued by a judge.

Today the U.S. Court of Appeals for the Ninth Circuit issued a disappointing but fortunately narrow decision in a case involving warrantless tracking of a vehicle with a GPS device. The three-judge panel refused to exclude GPS tracking evidence under what’s known as the “good faith” exception, ruling that when the tracking took place, law enforcement agents reasonably relied on binding circuit court precedent in concluding that no warrant was necessary. The tracking happened before the Supreme Court issued its decision in United States v. Jones that GPS device tracking triggers Fourth Amendment protections.