@Taxes-by-Rocky   Well, no, that currency is not moving through the US banking system.  As much as one-half of the value of U.S. currency is estimated to be circulating abroad.  Because, for one reason, the banks are already doing a good job of keeping the criminals from having accounts.  Also, the cannabis dealers who operate under our schizophrenic regime of dual sovereignty.  

Was it India that recently recalled all its old currency and replaced it with new currency?  We could try that.  At least the Bitcoin investors would profit.