Actually, cocaine is pretty much on all money. It becomes like the metal strip in bills. If you have enough bills, there will be a lot of metal for detectors. Likewise, if you have a lot of bills, there will be a lot of cocaine for a dog to detect.
I swear it is almost as though the government put it there on purpose.
"... There's no way to rule innocent men. The only power any government has is the power to crack down on criminals. Well, when there aren't enough criminals, one MAKES them. One declares so many things to be a crime that it becomes impossible for men to live without breaking laws. ......just pass the the kind of laws that can neither be observed nor enforced nor objectively interpreted -- and you create a nation of law-breakers -- and then you cash in on guilt. Now that's the system, Mr. Reardon, that's the game, and once you understand it, you'll be much easier to deal with." - p.411, Ayn Rand, ATLAS SHRUGGED, Signet Books, NY, 1957