Watch NCIS: Los Angeles Season 4 Episode 20 online via TV Fanatic with over 6 options to watch the NCIS: Los Angeles S4E20 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, Google Play, and USA.
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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.