If the bank allows customers to exceed either the 6 per month or the 3 per month limit, the bank can be cited and/or penalized.
The "best practice" seems to be to allow customers an occasional slip. That takes in the "late presentment" problem (Christmas checks cashed in January) and human error. But those slips shouldn't be more than one or maybe two items in a month. When a customer exceeds the limits, though, you should be communicating with the customer to get his/her behavior changed.
If you need to contact the customer more than three times in a rolling 12-month period, you should take away transfer ability, close the account, or convert it to a transaction account.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8