As far as the drug money goes, at the height of the cocaine craze I was involved in a legitimate business in which large amounts of cash was handled, and at the end of the day there was a trace of numbness on the fingertips from handling so much cash that probably had trace amounts of the narcotic. I'll bet bank tellers and cashiers at casinos felt a similar sensation. It also convinced me that a drug dog could probably "hit" on a large percentage of innocent Americans! Ever since, I wash frequently and use those wipes the casinos hand out.