Roomates are at ends with each other

[Jeffrey Linville]

So I have this unit that I rented out to two very nice college boys. I met them, vetted them and ran checks on them. They said they where both serious about school etc. Well apparently one of them is now skipping school, doing drugs in the house and there is damage with holes in the wall. The other called and told me about the problems. I can't have this and know I need to do something, the other seeks like he would stay. Can I evict just one roommate even though they are both on  the lease? What would you do?