I'm pretty good about screening guests. I don't have anything against people who smoke marijuana or even proprietors of marijuana businesses. Our home is a non-smoking home and it's one of the check boxes people must check when booking.
I'm going to be somewhat vague here but I want owners to think about who they rent to and what they might do when alone in your home.
I rented our home to someone with a common name that was hard to research on the internet. It was only later that I identified him as the owner of a marijuana business after all this went down and I had more identifying information to go off of.
After he vacated the house we discovered evidence that our home was being used to turn marijuana into Butane Hash Oil (BHO)/marijuana wax. Yes, that is the process that you've read about in the newspaper where the butane/house explodes and the people doing it are severely burned. Fortunately, there were no explosions in our house during his stay, but we know what he did. Needless to say, it placed our home, his safety and our neighbors' safety at risk. And if there had been an explosion? Not only would the house have suffered severe damage, but you can bet there would be a public outcry and a push to outlaw AirBnB in your entire city, and if not the whole city, then certainly your home would be barred from AirBnB rentals.
So my advice to you, especially if you host in an area where marijuana is legal and there is a pot shop on every corner, don't rent to anyone you identify as a marijuana business owner. There are houses in the area that advertise as being 420 friendly and even provide marijuana upon check-in. Why he didn't rent one of those is beyond me.
On the bright side, at least now I know how to clean marijuana wax off of hard surfaces. We tried Clorox wipes, Lysol wipes, glass cleaner, etc., all had no effect. Isopropyl alcohol was the only thing that did the trick.
Live and learn.
I should add that my review of the guest documents much of what I found, but it does not specifically say they were making BHO or otherwise engaged in illegal activity due to my fear of being sued. Any host reading my review will not rent to this guy. Hosts need to call guests out on their behavior in their reviews so other hosts can choose guests wisely. I suspect that this person will not be writing a review because he knows that it is unlikely I wrote a good review, so my review of him/warning to other hosts will never post. As such, he will continue to be able to book with AirBnB and put other hosts at risk.