24: Day Zero S01 E04 Episode 4

Mason criticized the fact that Laszlo was killed regardless of CTU's surveillance. Jack, arm in a cast, believes that Laszlo was getting information from someone inside CTU, making Mason believe that a CTU agent had Laszlo killed. Jack tells Mason to bring Division into the investigation, but Mason denies this request. Jack presses the issue about someone within CTU working against them.