1. A computer-implemented system for detecting potential counterfeit financial cards, comprising: a computer database comprising financial card transaction data reported from a plurality of financial institutions; scoring means for assigning weights to individual transactions to identify suspicious transactions, the suspicious transactions and particular cards involved in the suspicious transactions being assigned a score; means for categorizing said suspicious transactions into event groups based on a geographic region where said suspicious transactions occurred and a time when said suspicious transactions occurred; event scoring means for scoring said event groups based on transaction scores and card scores in said event groups to identify financial cards involved in a suspicious transaction in a same geographic region during a common time period to identify a cluster of potential counterfeit financial cards.