I used to work at my dad's currency exchange. You know why they get away with it? Telling fakes from real requires WEEKS of training. We would get information f

I used to work at my dad's currency exchange. You know why they get away with it? Telling fakes from real requires WEEKS of training. We would get information from the US Mint, Treasury and the Secret Service. The capital investment required probably will outrun the training cost for most retailers.