My initial process is to review a system generated report that list all accounts by branch that an employee has signatory authority over, not including bank owned accounts, that provides information such as number of credits, number of debits and current balance and averages. I target those accounts that have indication of kiting or unusual # of credits. Other accounts may be reviewed at random.
To show the effectiveness of this method, two employees at one branch that were terminated for less than reputable reasons were targeted by this report. One was insider abuse, the others husband was involved in a drug ring.
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An error is not a mistake until you refuse to correct it