A levy only legally attaches available funds in their deposit account. Any such action by the bank to seize additional funds will place the bank in jeopardy of being sued.
I would:
1. Close all accounts.
2. Make sure you have a policy not to cash checks for non-customers or charge a hefty fee.
That way it sends the deadbeat down the road and gets them out of your hair, because if all you are doing is cashing checks for them you are losing money.
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