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Looking to watch NCIS: Los Angeles Season 4 Episode 20 online? TV Fanatic is your destination for every paid and free streaming option of the NCIS: Los Angeles S4E20 full episode from 2 affiliates.

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Episode Details

NCIS: Los Angeles Season 4 Episode 20: "Purity"

The team must figure out if cyanide put in a water jug is an isolated incident or a test for a much larger attack on NCIS: Los Angeles.