Marijuana Odor

[GordonemThomas]

So, have a pair of tenants that just moved in 7/1. No problems except the smell of marijuana when inside unit. They claim I'm not smelling them smoking, I'm smelling their stash. I have no direct evidence of them smoking. I am not a fan of booting them out and trying to find tenants again. However, if I can get direct evidence that they are smoking I will boot them. Any sources to get direct evidence of them smoking people have tried or heard of? It's in my lease that this is a non smoking building. 

[Kassandra RPM Alaska]

Smoking vs just havnig the stash are two different things.  Finding someone smoking and evicting on those grounds are very difficult.