Associated Press | May 7, 2009
By Ryan J. Foley

MADISON, Wis. - Wisconsin police can attach GPS to cars to secretly track anybody's movements without obtaining search warrants, an appeals court ruled Thursday.

However, the District 4 Court of Appeals said it was "more than a little troubled" by that conclusion and asked Wisconsin lawmakers to regulate GPS use to protect against abuse by police and private individuals.

As the law currently stands, the court said police can mount GPS on cars to track people without violating their constitutional rights -- even if the drivers aren't suspects.

Officers do not need to get warrants beforehand because GPS tracking does not involve a search or a seizure, Judge Paul Lundsten wrote for the unanimous three-judge panel based in Madison.

That means "police are seemingly free to secretly track anyone's public movements with a GPS device," he wrote.

One privacy advocate said the decision opened the door for greater government surveillance of citizens. Meanwhile, law enforcement officials called the decision a victory for public safety because tracking devices are an increasingly important tool in investigating criminal behavior.

The ruling came in a 2003 case involving Michael Sveum, a Madison man who was under investigation for stalking. Police got a warrant to put a GPS on his car and secretly attached it while the vehicle was parked in Sveum's driveway. The device recorded his car's movements for five weeks before police retrieved it and downloaded the information.

The information suggested Sveum was stalking the woman, who had gone to police earlier with suspicions. Police got a second warrant to search his car and home, found more evidence and arrested him. He was convicted of stalking and sentenced to prison.

Sveum, 41, argued the tracking violated his Fourth Amendment protection against unreasonable search and seizure. He argued the device followed him into areas out of public view, such as his garage.

The court disagreed. The tracking did not violate constitutional protections because the device only gave police information that could have been obtained through visual surveillance, Lundsten wrote.

Even though the device followed Sveum's car to private places, an officer tracking Sveum could have seen when his car entered or exited a garage, Lundsten reasoned. Attaching the device was not a violation, he wrote, because Sveum's driveway is a public place.

"We discern no privacy interest protected by the Fourth Amendment that is invaded when police attach a device to the outside of a vehicle, as long as the information obtained is the same as could be gained by the use of other techniques that do not require a warrant," he wrote.

Although police obtained a warrant in this case, it wasn't needed, he added.

Larry Dupuis, legal director of the ACLU of Wisconsin, said using GPS to track someone's car goes beyond observing them in public and should require a warrant.

"The idea that you can go and attach anything you want to somebody else's property without any court supervision, that's wrong," he said. "Without a warrant, they can do this on anybody they want."

Attorney General J.B. Van Hollen's office, which argued in favor of the warrantless GPS tracking, praised the ruling but would not elaborate on its use in Wisconsin.

David Banaszynski, president of the Wisconsin Chiefs of Police Association, said his department in the Milwaukee suburb of Shorewood does not use GPS. But other departments might use it to track drug dealers, burglars and stalkers, he said.

A state law already requires the Department of Corrections to track the state's most dangerous sex offenders using GPS. The author of that law, Rep. Scott Suder, R-Abbotsford, said the decision shows "GPS tracking is an effective means of protecting public safety."