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He bridges the gap between old school NYPD and the new generation of CSI. He is a witty homicide detective who has very little patience with the "bad guy", and his techniques are sometimes considered somewhat borderline, though effective. He is good friends with Danny, and is always willing to lend an ear to Danny's problems ("On The Job"). Flack has to arrest his former police mentor, Gavin Moran, when it comes to light that Moran had concealed evidence in episode 117 ("The Fall"). During the season two finale, Flack was severely injured in a bomb explosion, and ended season two still in a coma. As of the season three premiere, he is fully recovered and back on duty with CSI, chasing down suspects with all of his previous endurance. Flack is very protective of his "guys", sometimes to a fault. In "Consequences", he was reluctant to help Mac when evidence seemed to point to one of his men as the killer in a case Mac was working. Flack was ordered to hand his notebook, in which was details of a drug bust in which some of the drugs disappeared, over to Mac, which caused some serious tension between them for a brief period of time. By the end of season three, the tension had dissipated, and Flack steadfastly supported Mac when the latter was questioned about the death of serial killer Clay Dobson.