1. A computer-implemented method, comprising: (a) maintaining a database of known fraudsters, wherein each fraudster has a voice signature and metadata associated therewith; (b) segmenting the database into a plurality of segmented databases based on the metadata; and (c) performing a screening operation using a computer to match a candidate with a fraudster in the database based on matching a voice signature and metadata for the candidate with a voice signature and metadata for the fraudster in at least one segmented database, wherein each voice signature is assigned a home segmented database within which it has an accept rate, and for each voice that has gone inactive within its home segmented database, a search is carried out to determine if the voice signature is active within another segmented database.
3. The method of claim 1 , wherein the matching is first performed based on the voiceprints; and thereafter the results of the matching are ranked based on matching of the metadata.