"Surveillance" is the word best describes both the work of Red John and Ray Haffner. Red John is a professional serial killer. He does not want to make any mistake, so do his work best by following his targets like a shadow and study about their routine before he makes a move to kill them. Ray Haffner closes cases through "creative surveillance techniques" as mentioned by Lisbon in season 4 episode 2 and we have seen him doing that not only he bounds Cho to keep an eye out on Pattrick but also when he goes to Bertram to seek help to monitor the list of people on the red fake diary imitated by Pattrick which belonged to the victim of the same episode to throw Haffner out of the trail in order to solve the case with Lisbon to help her to get her job back. So both these people put on for surveillance before they move for their target.                                                                                   Besides Haffner has friends in FBI since he used to work their before. So it was easy for him to get to know that Pattrick did not kill Lisbon and Rigsby in the season 4 finale when FBI Agent Darcy claims that Lisbon and her team are playing them.