Somewhere I read that all paper money that has been in circulation has traces of drugs on it from being in the hands of someone buying or selling drugs. Weather that is true or not, money is still very dirty, people will cringe if you walk out of a restroom without washing your hands when urine is the same chemical make up as sweat but no one thinks to wash their hands after handeling money that has been handeles by many many poeple and exposed to a lot of nasty stuff.