A criminal conviction is not an automatic disqualification.

I told them once their application is accepted, we will proceed with screening which includes credit and criminal check from cozy.I did not provide the qualification in writing, but verbally told them that:1.

I put that I do a background and criminal checks as well as the income they will need to qualify.

Also SS# lets you access criminal report, and verifies they are legal in the states. 

I called Skagit Title to ask them if they ever work with wholesalers and they responded to me as if I were a criminal.  

Can it check credit and criminal history of new clients?  

Their interface is clunky at best but they do the full credit, eviction, and criminal check and you can have the applicant pay for it directly rather than pulling a fee and paying yourself.Cozy.co also provides a screening service, but unless they have updated it they were missing one of the big 3 checks last I looked.

Your best bet is to use the public records available today to landlords which include credit reports, criminal convictions, and eviction history.  

From a regulatory aspect you have risks of criminal activities and large fines and jail is real.

Credit scores aren't a deal breaker for me, but a prior eviction or a criminal record would be.