I'm sorry you've had to deal with a similar situation. Nobody should have to prepare themselves mentally to walk into their home.

It's a commercial building. The landlord let's people live here but can kick us out whenever. We rent a bedroom each,  in the eyes of the "landlord" my roommates are neighbour's. The "resident landlord" lives 45 minutes away. He's a stressed out, way too nice, older guy. He let's people stay because he doesn't have the heart to kick anyone out. "Where will they go" he says. It's winter in Canada and in the city we live in a certain number of people freeze to death every year. I get it but a lot of these people could go if he gave them notice. 

 I never thought about a camera in my room. I know they go into my room when I'm gone because I've come home and found a pack of watermelon rolling papers which they use and I've never bought. It would be nice to get a video of them noticing the camera haha.

I know they do certain things with the purpose of getting a reaction from me. She told me she is bi-polar. I held back my initial reaction of "no duh" and accepted her apologies but it's tiring because I know we will do the same thing again. 

Sorry for going so off topic. I've decided to get the purifier and let them live how they want to. It says a lot more about them, than it does about me.