GPS tracking by law enforcement is illegal in the United States without a search warrant.
In the case of the United States v. Jones, 132 S. Ct. 945, 565 U.S., the United States Supreme Court ruled that installing a Global Positioning System (GPS) tracking device on a vehicle and using the device to monitor the vehicle's movements constitutes a search under the Fourth Amendment.
Law enforcement can bypass the need for a warrant using FULCRUM, a non-GPS based tracking capability.
By using WiFi signals, FULCRUM can track a target to within a few yards depending on the density of the wireless access points in any given area.
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