No GPS tracking without warrant, ACLU demands[ Tue, 19 Mar 2013 18:28:23 GMT ]The ACLU is in federal appeals court Tuesday, arguing that law enforcement should be required to obtain a warrant from a judge before attaching a GPS tracking device to a suspect's car. The Department of Justice says that the case in question didn't merit a warrant because there was more than enough "reasonable suspicion" and "probable cause" about the suspects for the device to be attached to the vehicle.