Some specific things I can tell you about the Spokane/North Idaho market- I have noticed that once marijuana became legalized in Washington, properties on the Idaho side of the border started becoming more expensive than properties on the Washington side.

"Drug related criminal activity" means the illegal manufacture, sale, distribution, use, or possession with intent to manufacture, sell, distribute, or use an illegal or controlled substance.2.Shall not allow entry of anyone in violation of court protection orders3.Shall not engage in any act intended to facilitate criminal activity4.Shall not permit the dwelling unit to be used for, or to facilitate criminal activity, regardless or whether the individual engaging in such activity is a member of the household, or a guest5.Shall not permit excessive traffic or visitors (i.e. more than 3-4 drive ups or walk ups per day)6.Shall not engage in excessive drinking, public disturbances, verbal abuse, or spiteful threats7.Shall not engage in the unlawful manufacturing, selling, using, storing, keeping, or giving of an illegal or controlled substance, at any locations, whether on or near the dwelling unit premises8.Shall not grow medically-approved or other marijuana in or around the premises; Limit supply for own medical purposes per RCW 69.51A.040; Not smoke/vaporize medical marijuana anywhere in or around the premises.9.Shall not engage in any illegal activity, including prostitution, criminal street gang activity, threatening or intimidating, assault, including but not limited to the unlawful discharge of a weapon, on or near the dwelling unit premises, or any breach of the lease agreement that otherwise jeopardizes the health, safety, and welfare of the landlord, his agent, or other resident, or involving imminent or actual serious property damage.10.VIOLATION OF THE ABOVE PROVISIONS SHALL BE A VIOLATION OF THE RENTAL AGREEMENT AND CAUSE FOR IMMEDIATE TERMINATION OF TENANCY.

There's another service that isn't coming to memory that detects cigarette and marijuana smoke.

The strangest thing I have found was Marijuana Plants growing in the back yard.

Her neighbors on both sides play loud music very loudly until late into the evening and they both constantly smoke marijuana and cigarettes, which are both items in direct violation of the lease agreement and the landlord does nothing to stop this behavior.

So the guy that enforced the building code against medical marijuana clinics got tips from other medical marijuana clinics. 

This creates a peculiar situation where we are going to have a sewer installed prior to the basement walls.

Coachella Valley and Desert Hot Springs are booming right now because of Medical Marijuana.  

In a duplex of mine, a tenant called saying they thought the tenant next door might be smoking marijuana.

Mine is 17 pages, including the lead based paint disclosure (2 pages) and the pre-move in damage checklist (3 pages).The Marijuana and Smoking clauses take up 1/2 page.Acceptable use is 1/2 page.Discussion of HOA and its rules takes up 1 1/2 pages.Pets and pet deposit takes up 1/2 pageLate Payments, NSF Checks and other payment discussions take up almost 3/4 of a page.