Haggis, Taddies, Gorgonzola cheese, scrapple, fresh tripe... and, I'd keep the good stuff hidden very carefully.
I would also install a deadbolt on my bedroom door. You can get cheap ones for less than $10 (US).
If this person was having financial difficulties, I'd charge an extra $30 a week, and give this person a grocery list, and make him do the shopping with a prepaid debit card for the aforesaid groceries.
I know - it can become grueling after awhile, but if you need the roommate, then, think strategically. Make it work for both of you.
My first roommates were a partying, motley crew. I had to learn about eviction law, and, when things started going awry, I called a 'house meeting', since I was the signed lessee.
"Okay, Reno, here's the deal: you don't clean up behind yourself; you mooch off of my brother and I, and I've had enough!" I handed him a typewritten eviction notice, giving him thirty days to leave.
Believe it or not, his parents came over, with a check after that, every month, and he started living normally.
Whatever normal is. In 1979-80, things were kinda weird. Cheap pre-Reagan weed, cheap grain alcohol to make Monster Mash with (just add fruit, and juice), and we all woke up to the sound of brains frying.
College. Which, I never truly finished. I wonder why... LW