What a muddle this ruling seems to be - 4 weeks of 24x7 GPS tracking is not okay, but some lesser amount of GPS tracking might be okay? What huh?
Well, no... that's not the issue. What is the issue is that the GPS tracking was done outside the parameters that were imposed by the warrant. This is the civil equivalent of a military superior saying "you can only go up to 20 miles away, and no alcohol, because you are on-call" and then the subordinate went 40 miles away and got piss-drunk.