No privacy for the kiddies.
Saw an advertisement on Yahoo for a product: Vehicle Location and notification 24/7 roadside assistance Remote vehicle unlock..
but the add ran "Bye, I'm going to ____'s" then shows the car, go to that house, then by that house, and stop somewhere else and then it says "Find out where they're really going."
Similar services exist for cell phones too.
Here's the thing, none of it's insurmountable. Just because your car stays at Jenna's, doesn't mean you do. Or your cell phone. But if they think you're looking too closely, they'll abandon all the things that exist to aid them.. doors they have keys to, means of communication anywhere, etc. You'll know a lot more about what's going on if you're an ally rather than an adversary.