[TheNewGirl]

In the future, in your tenancy agreement that you have your tenants sign you can put in a clause stating that participating in illegal activities will result in immediate eviction. While personally I don't take issue with smoking a bit of weed now and then, as a land lord your liable for activities that happen on your premise so I wouldn't want my tenants doing so in and on my property. If you have such a clause and can demonstrate that they read and signed it, you can get to the eviction process faster in the event that you need to.

Additionally you should always use the rental/tenancy board's formats if they provide them (they're on their web site) which will help protect you if the tenant tries to tie you up in arbitration.