Crazy or Smart?🤔

So recently I had my wallet stolen from my house. According to the cops someone broke into the house and only took the wallet. My fiancé and I have a roommate and his girlfriend was over the night it went missing. I’m gonna be straight up. I believe one of them took it because she don’t have a job and he had just started working. His birthday was that following Tuesday and he wanted to get fucked up but how? He had no money. Well here’s the thing. I feel like either he took it for that or his girlfriend took it because she would never give my fiance and I the time of day when she came over. I’m thinking about getting little spy cameras and sitting them around the house without telling my fiancé because it’s his friend and I just kinda wanna know what the fuck is going on in the house that has my name on the lease and my name only. You know? Smart? Or you think it’s a little too much?