[soapbox]
I am generally opposed to much of what the ACLU does, but I hope they prevail here. Government shouldn't have the right to just track (with a hidden device on your property at that) anyone they want without going through the protection and process of a court order.
It starts with people that could never be you, so you don't protest. Later they track you because you once bumped into someone on the terror suspect list. Even later, they track you looking for dirt on you because you publicly exposed just how compromised fire protection in your city is now due to policies of the city council.
It starts with tracking your cars location. Later, they monitor your conversations in the car. Later, they record video of you in your house...
[/soapbox]
Oops, sorry the OP requested that this not get political.