The old "drug users fund terrorism" canard is getting new play in Europe this week, where French and Spanish intelligence agencies reported that, as the Guardian (UK) put it, "Cannabis cash 'funds Islamist terrorism'". The report was the result of an investigation launched after the 2004 Madrid train bombings that found the bomb plotters bought their explosives from former miners and paid them in hashish. The intelligence agencies also claimed that the Al Qaeda-linked Algerian Salafist Group for Preaching and Combat is using hash sales as part of "a complex network" of financing its terrorist operations. I don't doubt that. People who need money for nefarious schemes typically resort to the black market economy, whether it is drugs, diamonds, oil, or whatever commodity. It is so screamingly obvious that I hesitate to point it out, but pot smokers don't fund terrorism—prohibition does. You don't hear of barley or grapevines or tobacco leaves funding terrorism because they are used to make non-prohibited psychoactive drugs that are integrated into the legal, aboveground economy. If you want to stop Islamic terrorists from using the black market profits from the hash trade to buy bombs, the solution is clear: End the prohibition regime that creates the black market.