The listing also says "no smoking of any kind" ... potential tenant's Facebook and instagram have marijuana-related photos in the banner.

I attended a medical marijuana briefing by a criminal attorney (defends medical marijuana businesses) recently who described CA SB 643, the Medical Marijuana Regulation and Safety Act (MMRSA).  

Use of illegal drugs by all Tenants is prohibited, (including marijuana).

The problem deepens: The old landlord chose to go with a non-standard lease agreement that does not cover the topic either smokers or pets in any way, not even a passing mention (and there's no addendum for either as well).I want the two male tenants out; I have been told that they are smoking in the house (including marijuana), though at the moment I do not have any personal verification of this (I do know they smoke outside). 

@Nikki RobinsonDenver is great city & real estate market - irrespective of marijuana legalization.However, that issue has also provided an economic boost.I was watching Bloomberg TV a couple of weeks ago & they decided to interview the founder of Marley Coffee. 

Once we do about a 100k rehab It will produce us an 8.5 cap at 2$/sf NNN if we just lease to regular medical and/or related businesses as it's right in the middle of a very heavily populated medical zone.Depending on timing and wether Marijuana gets a green light in November in 26 States including Cali we could lease it to a MJ dispensary on a 20 year lease with a  high double digit cap NNN.Personally, I think the train has left the station on MJ and the Fed will have no choice but to acquiesce to the desires of the 30 plus stated that will have legalized or at least de criminalized it.

That often causes their charges to be enhanced to felonies.You might also find that cultural norms are changing.While I am extremely anti-drug use, you might be surprised that the majority of people in many states thinks it is insane that someone would hold marijuana use against someone. 

I'm concerned about my existing holdings however, the anti-marijuana legislation imposed by Nevada, Yuba, and surrounding counties will crush the cash economies and significantly hurt my renter pool, as well as my ability to flip vacant land here.  

Illinois is a medical marijuana state but we do not have dispensaries yet.  

The other issue is that I can't get title insurance on one of the properties as it has a marijuana cultivator on the premises.