Home / Series / NCIS: Los Angeles / Aired Order / Season 4 / Episode 20
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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.

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  • Originally Aired April 9, 2013
  • Runtime 45 minutes
  • Content Rating United States of America TV-14
  • Production Code 420
  • Network CBS
  • On Other Sites IMDB
  • Created March 17, 2019 by
    Administrator admin
  • Modified October 18, 2022 by
    ebjo
Name Type Role
Joe Sachs Writer
Bree Condon Guest Star
Steve Tom Guest Star
Steven W. Bailey Guest Star
Tom Gallop Guest Star
Lily Mariye Guest Star
Mark Espinoza Guest Star
Omar Elba Guest Star
Kent Shocknek Guest Star
Travis Aaron Wade Guest Star
Rance Howard Guest Star
Jay Ellis Guest Star
Jade Carter Guest Star
Chris Bruno Guest Star
Owen Teague Guest Star
Eric Laneuville Director