Sex offenses are among the most serious crimes a background check can uncover. Recently, we have heard from some HR professionals who thought they are doing enough to find sex offender records with local and national criminal searches. In some instances, they expect a National Criminal Database Search, with all of its vast sources, to include all sex offender registries and sources. That is not always the case. With that misinformation in mind, a separate sex offender registry background check may seem redundant.