@Joshua Myers, I have no idea why you insisted on writing the first paragraph. 30 years in the work force and 30 years doing my own thing, I never comment on people's behaviors without knowing them.

(actually happened)Showing up more than 10 minutes late without calling or textingInability (or unwillingness) to comport themselves in a reasonably polite and businesslike manner during a showing.Rude behavior (to me or to others in their party).

Anger management issues, psychological problems, drug abuse, criminal behaviors, etc. are more prevalent in those areas.

Personalization: By tracking client behavior and preferences, you can tailor your marketing efforts, making your leads feel like you understand their unique needs.3.

It violates pure landlord/tenant boundaries and leads tenants to behaviors you don’t want

its more of a behavior not how low the interest are. 

I would recommend you going onto Zillow and display "for sale" and "for rents" on the same map to get an idea of the ratios.  

(who wouldn't have bank account these days)Employer name didn't displayed in the credit report.Not sure, if any of the concerns are red flags ?

Psychology could benefit in marketing analysis, understanding consumer behavior, etc.

Here is the link to the source, although it's mostly mortgage professional related stuff: https://singlefamily.fanniemae.com/media/36841/display