A police officer is not entitled to walk up to your home and peer through your window. He's not allowed to use his flashlight to look through your window. It's not like a traffic stop. On a traffic stop, a police officer is allowed to use his flashlight for his safety. He's allowed to look through your car from the position where he stands, but he's not legally allowed to be at your home. So, if you see a police officer peering through your window, I would tell him through the window, "I don't consent to any searches. Please leave my property." I might even call the police and say, "Hey, I've got this weird guy peering through my window." and ask for his supervisor.