I should add, like others have stated, that like the second hand contact/inhalation of cigarette carcinogens, the ingestion of toxic spores would take quite some time to genuinely make you ill, aside from maybe a little runny nose or small headache...which brings me back full circle to the "myriad of other illnesses."

Really the main risk when inheriting tenants is that a) they have a long lease in place thats under market rent and b) the tenants are poorly managed and do not know the procedures of your company. 99% of the time people are genuinely nice and just want to continue living in their current home.

I was genuinely trying to figure out her "financial picture" to understand if she can afford the rent.

@William Coet The GPs are active and the LPs are passive.

I asked if she was aware of their history when she rented to them and she said she was.They seemed like pretty genuine people.

I don't plan on doing this job forever anyways though.Not trying to sound like I'm attacking, I genuinely appreciate the advice.

@Shawn Burns I would ask them to fill out an application only once they have had a showing and are genuinely interested in renting the property.

If you treat people with simple honestly and kindness and respect, with a genuine desire to help them find the best deal for them, they will send their friends, family and acquaintances to you. 

I have date/gps time stamped photos from before move in and after.

People can usually tell if you're being genuine.