Hopefully you do a criminal background check as well as credit?

He does not have a criminal record.

It might be a good idea to have your lease forbid blocking windows with foil, or other opaque items other than curtains or commercially available window blinds (that are not flags or political).Drug dealers, and fake drug dealers tend to block windows so no light can get in, and no Police Officers can see in.As far as flags it's not a proper venue for National flags, and gives you leverage in case someone decides to hang flags offensive to some (such as public display of WWII Axis flags, or socio/political flags) that might be detrimental to your rental business.Good Luck!

.), along with a report that covers criminal, credit, and eviction history.

Advise that you have sent a Notice To Quit and you would like to have the occupants charged with Trespass/Criminal Mischief.3. 

Here's one nightmare scenario:Adult children move in without signing a lease or undergoing any screening or verificationCurrent on-lease tenant suddenly moves outThe "temporary situation" ends up lasting a year or moreNow you've got two unknown entities living in your property: no SSN, no credit check, no criminal background check, no rent verificationNope...Every (EVERY!)

Be sure it's a RE atty, don't get a criminal one to do it.

There's a good chance you'll be repaid if he is charged criminally. 

I would like to learn how to fund all the credit reports, criminal records, rental history, etc. 

Find a police officer new boyfriend who parks his car in the driveway, or son of someone who is a Marshall, or bail bonds man car with the lights on it.What criminal convictions does the boyfriend or occupants have?