In 2001, there was a state law passed against charging a fee for a noncustomer to cash an on-us check, but it was overturned in federal court as being preempted by federal law. The injunction you are thinking of was actually brought by a group of banks against the state from enforcing the law against charging a fee for on-us checks cashed by noncustomers. You can charge the fee.
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Better a patient man than a warrior, a man who controls his temper than one who takes a city