I detest surveillance to track people but it seems to be a part of modern life. Like many, I use cameras and motion detection software to protect my home. But this GPS tracking seems to be way too invasive. But it invites jammers and methods to kill or redirect the signals. Interesting how cellphone signal killers are more and more available.
"A Wisconsin appeals court ruled Thursday that police can attach GPS trackers to cars to secretly track anybody's movements without obtaining search warrants. 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, wrote Madison Judge Paul Lundsten." - Source