National Background Data (NBD) is a supplier of electronic criminal histories. Another source is Rapsheets, which can be directly purchased on the Internet or through vendors. A few years ago, NBD presented at a conference of pre employment background screeners, discussing the database they compiled, its source material and the state of criminal records research. The presentation paper, The Role of Criminal History Databases in Conducting Background Checks, elucidates the source for and limitations of these records.
.