How do I know? Besides the mounted dashboard video camera and somewhat tinted windows? He told me. He was in front of my house when I left to pick the kids up from school and there when we returned. He saw me look in his direction more than once, then pulled in front of my driveway, rolled down his window, flashed an ID and introduced himself as a PI. Said he was doing work for an insurance company and that he would be in the area for a few days. Now, my wife is involved in a workers comp case with her former employer and has an attorney. If the dude is investigating her, why would he more-or-less tell me? By disclosing who he is, is he trying to suggest he's watching someone else? My wife has nothing to hide. I don't want those cameras taping my kids. Nice car, though.