Poop control. Everytime someone goes to the loo, the poop inspector takes a look at the toilets afterwards. Risk: Everyone is even more uncomfortable, especially the sensitive souls who "can't go" if there is someone waiting for them in front of the door. Also, the poop inspector is a suspect, too, so who watches the watchman?
Other people who worked for the company that was taken over might still have the keys as well and they keep on pooping after their ringleader was arrested.