Kuehnlein himself pleaded guilty of assault and stealing in two different cases, in 1988 and 1990. He successfully petitioned a judge in St. Louis County in 1998 to expunge his criminal record, which was making it hard for him to get work as a cop. The judge ordered those records sealed, as well as records of an acquittal for drunken driving and an assault arrest that did not result in charges.
Court records might be able to be sealed, but Google is forever. Just type his name into Google and see how many hits come up with this incident with Brett Darrow.