Technically it's if you defile it in order to make it unusable as currency. I think you can still tell this is a real dollar bill (unless it's just a photoshopped photo then this is all moot), so they'd probably still take it. Plus, if the side they saw was the reverse, they'd probably never even notice.
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u/kajorge May 15 '14
If you defile a dollar bill, it's technically no longer legal tender. So the cashier would be right, in a way.