Portland, Oregon - Can I evict my tenant for smoke alarm issues?

[Mark Ko]

PDX has some of the craziest tenant protection laws and I (single home landlord) need my tenants out. The way it works here is I have to renew their lease and only they can walk off it. I kept my rent low because they seemed nice, didn't make much and to me this was just a temporary thing until we sell the house. Yet another fool, I know.

So question - have you ever served an eviction notice for not having running batteries in the smoke detectors? What about yard maintenance? 

The former is in the contract but I have a feeling the pothead in one of the rooms has the batteries removed. Now I wish I could serve notice for pot usage (also in the lease) but I don't know how to prove that.