Some questions -
Where are these counterfeit checks posting - specific customers, internal bank accounts, or all over the board.
If specific customers (close and open a new account), if internal bank accounts (Positive Pay comes to mind), if all over the board (as hokey as it sounds - teller training and teller work review process) are some suggestions......OR review your Funds Availability Policy -
Also, review your daily reports - do you have an uncollected funds report - having someone monitoring and reviewing deposits might not hurt either. Have someone at each branch do it so they can learn what to look for when the deposits come in.
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My comments are absolutely no reflection of, nor influenced by, my employer - take them at your own risk.