Your comment, "Need drug dealers and hookers too." 

Pitbull owners sure are passionate.Here are some other under-served markets:  child molesters, repeat felons, drug dealers, people with evictions, etc.Everyone is free to run their business as they wish, just so long as they are willing to live with the consequences.If you think a waiver signed by a tenant will keep someone from suing the "deep pockets" landlord, you are in for a surprise.

weed mellows people out much better than tweaker drug addicts or getting drunk and destroying things.. 

They will likely list all of their expenses (ie: prescription drugs, phone bills, etc), and also inform you they are on a fixed income-- when you tell them it's going up.   

Sorry forgot to list experimenting w drugs! 

That sounds more like drugs than drunk, but it's crazy either way.

They want to live on the streets, so that their SSI check can go to alcohol and drugs, and panhandle for more money for alcohol and drugs.

Resident, and any member of the resident's household, guest(s) or other person(s) on the premises with the resident's consent shall not engage in criminal activity, including drug-related criminal activity.

I spent a decade in the motorcycle industry selling parts but no matter how hard I tried I couldn’t convince managers in auto dealers that my experience was relevant; however, after moving to manufacturing, I was able to convince my employer that my experience turning wrenches at home qualified me to be a technician even though I had no professional experience and hadn’t satisfied their alternative time on the job requirement.

They contacted me and asked me to work about 8 hours a day doing drug screens on their essential personnel.