FWIW, when we moved to rural WI, one of our neighbors ran a complete police search on us, just 'cause she's an officer and she could. Found out about it years later. Asked her, "How is that legal?" She shrugged, and said, "It wasn't. I did it anyway."

Our kids are friends, and I find it impossible to dislike her, but casual violations of privacy like that really tick me off. Likewise, police should show a judge reasonable cause before tracking your location via cell signal. We don't want to voluntarily live in a glasshouse.