The problem occurs when a single person uses a bill to snort coke and then give it to the bank, even if you put a single cocaine contaminated bill into a machine that counts bills it will spread to every single bill out there since cocaine is a very thin powder, same thing with any machine that comes in contact with bills like bank atms.
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I get the theory behind that, but I still do not see it working, as well as how can they test that.  I will coincide though since I cannot disprove that either as I have no access to some of the testing materials 



Lmao
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COCAINE IS ON YOUR FUCKING DOLLARS!  SNORT IT WHIFF IT JUST DONT FREBBASE IT OR YOUR DIE