This is probably a case of paranoia. When I lived with my very religious aunt & uncle in Blaine, WA USA, during my senior year -I was 17- I believed that they were monitoring my drug & alcohol use (I was doing that stuff very rarely). One way was by having some sort of device built into the toilet plumbing that would take a sample of my urine and send a signal to their bedroom and tell them if I was on anything (maybe even monitor pregnancy!). ...paranoia?
Another way was by collecting hair samples from my brush and the floor, and sending it to a lab. They were pretty wealthy, so they could afford that sort of thing!! (They shoulda been more worried about their own teens.)
A childhood belief about family

others believed things like this
- I used to believe that monsters lived in my toilet and they ate my poop and urine when i flushed the toilet.Anon
- I thought “guerrilla tactics” meant fighting like a gorilla— beating your chest and that sort of thing.— Kai
- I used to think a clitoris was some sort of dinosaur.Anon
- I used to think gladiators were meant to be some sort of alligator.Anon
- i used to think that being a prostitute was a religion. (sort of like protestant i guess?)Anon
- I used to think Uncle Ben and Aunt Jemima were a married couple. — l stu electtirc boogaloo