CSI: Crime Scene Investigation: Season 8, Episode 12

8 - 12:

Grissom and his team return to duty after long and bad bouts of the cold. Grissom is called on by DA Maddie Klien to be an expert witness in a Grand Jury case against a very dangerous Las Vegas gang - the La Tierras. They are terrorizing and murdering witnesses who could land them in jail and it is escalating. Grissom is reluctant, but Maddie insists he is the only one for the job.