Former DEA Senior Special Agent Michael Brown, currently the global director of counter-narcotics technology at Rigaku Analytical Devices, says cartels were given ‘carte blanche’ access to the U.S. border and are now retaliating. Former DEA Senior Special Agent Michael Brown, currently the global director of counter-narcotics technology at Rigaku Analytical Devices, says cartels were given ‘carte blanche’ access to the U.S. border and are now retaliating.