Johnson (Day 3)

Agent Johnson was an interrogation expert at CTU Los Angeles active during Day 3.

Day 3
The apparently criminal activity of Agent Gael Ortega within CTU caused his coworkers to believe he was a mole for Hector Salazar. He was captured and placed in holding. Eventually Director Ryan Chappelle brought in Agent Johnson to administer torture to Gael and extract information about his operation and conspirators.

Despite using syringes (probably filled with Hyoscine-pentothal) to inflict pain on Gael, Johnson was unable to get Ortega to admit if he had any accomplices. Tony Almeida left the care of Dr. Linzer when he heard that Ortega was captured, and when he arrived, Tony demanded that Chappelle excuse Johnson. After Johnson departed, Tony and Gael revealed to Chappelle and Michelle Dessler that Gael was not a mole after all.