Why a counterfeit money detector is a necessity for every chain store?

Just dream you are functioning as a teller and you receive a fake bill. You perceive something is unique although you are not certain. There is no counterfeit money detector to make certain its valid. What could you do in such a condition. Would you acknowledge it or would you disallow the bank notes. Most possibly you can disallow it, but then the client is telling that he just went to the bank. So these dollar bills should be valid. This cause you even more hesitant.

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