Season 4, Episode 20 Purity
First Aired: April 9, 2013
A Navy lieutenant dies and a pilot is hospitalized after they both drink from a communal water jug that is laced with cyanide. The team investigates to determine whether it is an isolated incident or an early test for large-scale water contamination.
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- Premiered: September 22, 2009
- Rating: TV-14
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- Premise: NCIS undercover agents work to crack the most difficult cases in Los Angeles. (more)