Langston uses deadly force for the first time in his career during the ninth CSI season finale. He looks pretty relaxed about it in this photo from the episode.
Added:
The CSI team heads to Las Vegas casinos in the ninth season finale. A series of deaths on the episode are tied to missing poker chips.
Added:
On the CSI season finale, the team investigates a poker-related murder mystery. The episode is titled "All In."
Added: