Bolivian counterfeit

So we were sitting in a cafe relaxing after work and the waiter comes out and asks us if we think the $100 US bill he is holding is fake!!  After much debate we agree that it is most likely fake be we don't want to commit since we are just a bunch of Canadian who don't really know anything about fake money. A lady had come into the cafe and ordered a coffee and tried to pay with $100, fishy right.  So the waiter runs across the street to the pharmacy for a second opinion eventually he returns and turns down the lady who hops in a waiting car and leaves.  All very strange,  but out translator tells us that this is common and there is no shortage of counterfeit bills floating around Bolivia.  Who knew.....