Entrapment by the FBI, possibly.

To Catch a Terrorist | Harper's Magazine: What made the deal illegal, according to prosecutors, occurred four months into the operation during a meeting in the informant’s office. Pulling back a tarp in his stockroom to reveal a shoulder-launched surface-to-air missile, the informant told Hossain, “I also do this business for my Muslim brothers.” Prosecutors claimed that Hossain should have been able to deduce that the loan he was receiving might be drawn from proceeds of an illegal weapons sale, and that by accepting the loan he had opened himself to charges of money laundering. Aref himself never saw the weapon. During one of the exchanges of cash—all of which were documented on grainy black-and-white surveillance footage—the missile’s trigger system, which looked not unlike a staple gun, was visible on a table. Prosecutors alleged Aref had seen the trigger and thereby had entered the conspiracy to “assist in money-laundering.”