So what's the normal level of cocaine that's acceptable on currency?
Almost all cash has trace elements of Cocaine.
Any level of cocaine that can be detected is grounds for seizure. From what I understand, a lot of money has traces of cocaine on it, even if the person who has the money has never used it.
Another excuse for more government power.
Thought I read somewhere that pretty much ALL $100 bills have minute traces of cocaine or heroine.