Mudar Rifaat al-Assad—a criminal, the son of a criminal, the cousin of Syria's dictator, and an active narcotics trafficker—is not only nowhere to be seen on Western sanctions lists, he holds a diplomatic passport from Antigua and Barbuda!

Source

Because he holds a diplomatic passport, he's immune; authorities can't search his bag when traveling. Every drug trafficker's dream!

P.S. Mudar is Bashar's cousin, not nephew as stated in the otherwise excellent documentary.