If you have their cooperation, you can request a national background check. You'll need social security number, etc. I think they may need to go get fingerprinted? Not sure of all the details, but I know you can get one. However, if they are not cooperating, I'm not sure how to go about it. I'm sure there is probably a way, but have only done background checks when I've sat on committees to hire people and they were willing to have the check done and cooperated.