pips&peeps :
I would put a call in to the authorities on your way out the door with the exact location of roommate #1's room. Maybe even let them know a good "time" to stop by is.
Only problem with that is... sigh... the cops tend not to want to be bothered if it is within a residence and...
Been there.. done that
Beckys Rules -
#1 - Paper plates. Plastic utensils. Plastic cups. Store in bedroom. Don't share.
#2 - Personal garbage can in bedroom (preferably with a good lid), personal rubbish bags, ect.
#3 - Small fridge and microwave in bedroom.
#4 - All bathroom niceties...