ALBANY -- New York's top court ruled Tuesday that police cannot place GPS trackers on suspects' vehicles without first getting a court warrant showing probable cause that the drivers are up to no good.

The Court of Appeals split 4-3 on the issue, with the majority saying the tracker that state police planted on Scott Weaver's van for 65 days starting in 2005 violated his constitutional protections against unreasonable searches.

The ruling overturned both the trial court and a midlevel appeals court. Weaver has been free on bail.

"The massive invasion of privacy entailed by the prolonged use of the GPS device was inconsistent with even the slightest reasonable expectation of privacy," Chief Judge Jonathan Lippman wrote.

Judges Carmen Beauchamp Ciparick, Eugene Pigott Jr. and Theodore Jones Jr. agreed.

They rejected the argument that the satellite tracking device was essentially the same as common police surveillance of vehicles.

"GPS is not a mere enhancement of human sensory capacity, it facilitates a new technological perception of the world in which the situation of any object may be followed and exhaustively recorded," Lippman wrote. "Without judicial oversight, the use of these powerful devices presents a significant and, to our minds, unacceptable risk of abuse."

New York State Police have declined to say how many GPS trackers they own or how they use them. They did not immediately reply to a request for comment on whether they were removing devices from vehicles Tuesday.

"The attempt to find in the Constitution a line between ordinary, acceptable means of observation and more efficient, high-tech ones that cannot be used without a warrant seems to me illogical, and doomed to fail," Judge Robert Smith wrote in a dissent. Judges Victoria Graffeo and Susan Read agreed and would have allowed the GPS evidence and conviction to stand.

In a second dissent, Read wrote that the majority opinion "unnecessarily burdens" police and the courts, while "handcuffing the Legislature by improperly constitutionalizing a subject more effectively dealt with legislatively than judicially." Graffeo concurred.

Weaver was convicted of burglary based in part on GPS data that showed him in a suburban Albany department store parking lot before a break-in. He will get a new trial with that information excluded.

Lawyers on both sides said the ruling establishes case law in New York and won't be appealed to the U.S. Supreme Court because the decision was made under the state constitution. Its provision against unreasonable searches and seizures generally mirrors that of the U.S. Constitution.

State courts in Oregon and Washington have rejected police use of GPS without a warrant under their constitutions. Some federal courts have upheld warrantless GPS use.

The Supreme Court has yet to address the issue, though in 1983 it upheld government agents' use of a beeper to track the movements of a container of chloroform.