At least in theory, actual physical installation of a tracking device without authorization would violate trespassing laws in many cases. So even if the governm

At least in theory, actual physical installation of a tracking device without authorization would violate trespassing laws in many cases. So even if the government doesn't try to introduce the results as evidence, it might be possible to file a civil trespassing suit. But, I have no idea what the odds of actually prevailing on that are (probably low).