I doubt the police would do anything based on your observation and could be a problem for you if you produce those pictures.  

As a disclaimer though, that is just an observation, you should never just run a credit check on your applicants.

I let tenants list any observations like that, then I ask them what specifically if they something fixed.

These are things that i will continue to study and observe as i move into this type of REI. 

Just a few observations from someone who did this repeatedly over a 24 year active duty career:First, owner-occupied financing helps a lot, but as others have said above, the numbers still need to work.

MA, TN, MD, NJ all have different rules, but we all observe "landlord/tenant law" per se.Google "Nolo".

Your typical big dog is going to bark less and pee on the furniture less but that's more personal observation than fact. 

It's a fact-based observation - one that you know is true.

In fact around here the number of older people looking for $450-$600/month rents are trending exponential.I have observed so many older people living in unhealthy disgusting accommodations because they can't or will not afford better.

Be prepared to observe:* Demeanor, interpersonal skills, communication style.