The same applies to passive devices they can place on your vehicles or belongings...
There is a recnt story about this guy who has found several different GPS trackers on his SUV over the last year...
The courts are reviewing the constitutionality of this investigative technique, without a warrant being issued before hand...
A couple of threads here on FR are still active on this issue...
They’re having fun flying over the attendees at the Texas Renaissance Faire. Our taxpayer dollars in use on getting photos of women spilling out of their corsets...