A method for processing a potentially fraudulent electronic payment transaction includes: receiving a first fraud detection rule configured to identify a potentially fraudulent electronic payment transaction; storing the first fraud detection rule in a fraud rules database; receiving a transaction request message; generating and storing a first case record associated with the first transaction in a case management database; receiving an updated fraud detection rule superseding the first fraud detection rule; applying the updated fraud detection rule to the first transaction to determine whether the first transaction does not satisfy the at least one updated fraud detection rule; and deleting the first case record from the case management database before the first transaction is further analyzed for fraud.