Bad tenant and wanting them out!

[Jerry Hill]

I have a situation where one of my tenants has been reported to me to be selling marijuana in his apartment. I have known and smelt the odor in his apartment before and have confronted him about his smoking in the property but to no avail. So I have decided to not renew the lease and have sent a letter to him stating this without mentioning the marijuana. The lease to the property is complete at the end of April. I have just today been called by a neighbor that they have said that they have gotten moved out, but now they have bragged about tearing up the place and leaving in it disarray. 

My question is do I have the right to go and change the locks now (15 days to end of their lease, but no rent has been paid for this month) in order to protect my property? What would you advise a landlord to do?