It is not the source that is important, it is the movement of funds. Somehow the $20 for a baggie in Chicago has to be moved/laundered/transferred to place where terrorists can purchase food, shelter, weapons, training, clothing, etc..
We should go after them with an army of accountants, which should be a scary thought for anyone who has ever delt with motivated bean counters.
;-)
Never thought of the IRS as an international weapon before. Lol.