Bathtub bandit strikes again!!

Yep, I found Landon in the bathtub again this evening. I assumed he was upstairs playing in his room. He couldn't have been in there more than 5 minutes. This time he left a nice brown present behind - yah, gross!! I am scared of the fact that he is actually getting into the bathtub without me knowing it. I think I need video surveilance in my house!! Or maybe a hook and eye latch above the door to my bedroom. Gads!!!!!