I get all the information I need to run their credit/criminal history report myself.

In Washington state, it can be considered a criminal offense to record a conversation without someone's permission. 

., complaints are received about an adult child's criminal behavior.

Some mentioned it above; I would run a full background check, looking more on rental history and criminal, and less on credit (you are adding them to a less that have been approved per your credit qualifications).

I use rentecdirect.com, which charges me $29.45 to run a criminal/credit/evictions search and I check references (employment and landlords) myself IF the reports come back looking good.  

@Ketsana Thepthongsaen-Are you looking for both criminal background and credit checks?

Assuming they have good references and no criminal history, it might be a good idea. 

What if it comes back and he has a criminal background or evictions?

(still might be okay,, but I don't know), trustee is LLC, who's managing member is not a real/physical person, the sole managing member is a "fictitious name" yes fake person..the fictitious name is made to appear, like a normal (although a bit foreign sounding) nameThe successor to the "fake" trustee is no other than the realtors/agent's husband (had to do some cyber digging to find this)and finally an assignment of beneficial interest in the land trust is to be signed by sellers to trustee LLC, whos managing member is this "fake trustee", which fictitious name is registered to the husband of the agentIn my perspective, the listing agent/broker never presented the better offer (i have proof there was a cash better offer),and consequently will end up owning this property......Thoughts ...comments...educate me please...

v=9gCCjFbFXn8 Don't forget the last tip: Never carry a gun anywhere, just to make sure you're not accidentally confused with a criminal...