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NCIS LOS ANGELES Season 4 Episode 20 Purity Photos : “Purity” – 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, on NCIS: LOS ANGELES, Tuesday, April 9 (9:00-10:01 PM, ET/PT) on the CBS Television Network.
