I used to be a cashier and the procedure we used was to simply refuse any money that we thought were fake and that was the end of the matter. I have a right to refuse the method of payment and demand an acceptable form of payment. A lot of people with fake money will use the implied threat of violence if we claimed it was fake.
A business can limit what they take as a form of payment, this is not illegal to do so.
“A business can limit what they take as a form of payment, this is not illegal to do so.”
And you are an expert on US state laws?
If you refuse to take my Obama three dollar bill that proves you are racist.
Lol.
But it's risky. If you refuse money from a disparate number of "protected classes," you could be found guilty of racial discrimination; that you're using your right to limit forms of payment as a pretext to turn away black customers.