Also, tenants are often on their best behavior on the "first date". 

I want them to see what it looks like to take a shot and they've got to see me speak on TV & stage, win awards & praise and they've seen me come home of stories of dead bats falling out of ceilings, cleaning up dog crap in dark basement corners, sucking out water from flooded basements for hours, bloodied, bruised, ect. ect. ect. and now be served with papers. 

They will sneak in a couple dogs, a second family, or their sex predator boyfriend.

Years ago when I was a licensed realtor working for my parents company in South Texas, a client called and told me that the house I sold her had a ghost dog. 

Find deserted, run down looking houses and contact the owners, etc....You are now describing a scenario of why no one needs agents any longer where Bird Dogs and Wholesalers are of more value. 

Our exterminator has a dog that can sniff for BBs. 

A warehouse building that was turned into a dog training facility and show place.  

Bird dog for them.

Unacceptable conduct, such as engaging with multiple neighbors and disclosing terms of my contract to parties other than creditors or banks and libelous behavior(basically engaging in gossip with 3rd parties).2.

For me when I'm estimating rental income I start by looking at the area for active listings <40 days old with similar characteristics to the home you're looking at purchasing (trying to find same bed/bath count, and same amenities like in CO homes with a fenced yard do very well because everyone has a dog).