Has any landlord here ever had to evict a morbidly obese bisexual drug addict, her fetishist feeder boyfriend, and all their sex toys and vintage fat-fetish porn VHS video collection?

And the "depression commodities"; sex, booze/drugs. 

TC charges $19.95 for a background check that includes credit score, evictions, criminal, sex offender registry). 

The credit report is only a "piece" of the full background I use so them pulling it and providing it to me is not acceptable because I also want to know their criminal background, address history, eviction history, sex offender status, what judgements they have outstanding and so forth.

Sometimes this is a way of hiding group homes for otherwise undesirable tenants (sex offenders, recovering addicts, etc).

You can provide them with a reason for not qualifying, but always ensure compliance with the Fair Housing Act, which prohibits discrimination in housing based on race, color, religion, sex, national origin, disability, and familial status.

If you do not take convicts, then this is a simple answer...NO.Once you start looking at the crime, and making judgments, you leave yourself open to that one person you say "no" to that turns around and sues you for discrimination because they happen to be a protected class, and you have a history of selective enforcement that they will argue was pointed at them because of their protected class.Next you'll have a sex offender who claims he was just peeing in public near a school....and the list goes on. 

Well, just about 20 seconds of searching the web and found this regarding how birddogging is clearly illegal in the state of Washington as they consider a birddogger to be a broker and must be licensed.RCW 18.85.010:(1) "Real estate broker," or "broker," means a person, while acting for another for commissions or other compensation or the promise thereof, or a licensee under this chapter while acting in his or her own behalf, who:(e) Engages, directs, or assists in procuring prospects or in negotiating or closing any transaction which results or is calculated to result in any of these acts;then there are exceptions to this rule (although none apply to birddoggers):RCW 18.85.110So, according to the state of Washington, accepting ANY (commission or flat fee or chickens or cattle or sex, whatever) fee makes you a broker.......as I stated before, one should check the laws regarding it in their state first.

They look into title issues, environmental hazards, flood likelhood, zoning, encroachments, pest infestations, CCR's, comps, plumbing, electrical, safety, structural, radon, sex offenders, planned highway projects, etc.   

And for kicks, take a look at a map of sex offenders....they are literally everywhere.