Watch NCIS: Los Angeles Season 4 Episode 20
When cyanide in a communal water jug lethally poisons a lieutenant and leaves a Navy pilot in serious condition, the NCIS: LA team investigates whether this is an isolated incident or an early test for large-scale water contamination.
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Series: NCIS: Los Angeles
Episode Title: Purity
Air Date: 2013-04-09
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