I am a law school graduate. What I offer is mere information, not to be construed as forming an attorney client relationship.
Okay, I am sure you know this can open you up to liability (civil and criminal). So, instead, may I suggest you hire a private investigator to get such child abuse records?
Even better, do you know where this person was possibly convicted/charged? You might be able to just march down and get the records yourself from the courthouse.