Then, regardless of what happens with the police, I will start the eviction process.I don't really care about marijuana.

I could just see it now where your dead partners son with majority interest in the company is like "We're liquidating all this real estate and starting a chain of marijuana dispensaries!

I came back to California and am getting her house ready to sell.The lease states no smoking in the room and he has been smoking marijuana back there.

While growing and distributing marijuana is against federal law, renting property is not.It is legal to rent your property using whatever lease you like to any industry they like.From a business operations perspective, you will need to figure out how to accept and deposit cash because, as you say, marijuana industries have no access to banking.  

In my case, my tenants ran a marijuana farming operation, steallling electricity, and growing at commercial scale.

If the rent wasn't being paid, you smell marijuana or hookers / druggies were camped out in the hall that would be terrible.

But don't expect them to move out and have the next tenant have the same peculiar tastes.

suggest edible marijuana?

In Florida the just passed the medical marijuana, so I'm sure we will begin to have those issues, but it still does not negate the fact that it is federal illegal, so still no smoking INSIDE of the property, by exterior is fine

And no smoker is going to go outside to smoke when they don't want to- they will open a window.One thing that cigarette and marijuana smokers don't recognize is how horribly they smell of their chosen vice.