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For other uses, see Sheriff (disambiguation).

SHERIFF is a telecom fraud detection and management system, originally developed by BT and MCI. SHERIFF is an acronym for Statistical Heuristic Engine to Reliably and Intelligently Fight Fraud.

Initially installed in 1998 to monitor BTs newly replaced calling card service - charge card - monitored out of the charge card operations centre in Liverpool. It was planned to expand the SHERIFF service into other BT LoBs but this was not completed. The SHERIFF system left BT when the fraud services group at BTs R&D site at Martlesham Heath in Suffolk UK was spun out as a separate entity known as Azure. Azure is now part of Subex.