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NCIS: Los Angeles: Season4 | Episode20
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.
S4 - E1Endgame Sep. 25, 2012
S4 - E2The Recruit Oct. 02, 2012
S4 - E3The Fifth Man Oct. 09, 2012
S4 - E4Dead Body Politic Oct. 23, 2012
S4 - E5Out of the Past (1) Oct. 30, 2012
S4 - E6Rude Awakenings (2) Nov. 13, 2012
S4 - E7Skin Deep Nov. 20, 2012
S4 - E8Collateral Damage Nov. 27, 2012
S4 - E9The Gold Standard Dec. 11, 2012
S4 - E10Free Ride Dec. 18, 2012
S4 - E11Drive Jan. 08, 2013
S4 - E12Paper Soldiers Jan. 15, 2013
S4 - E13The Chosen One Jan. 29, 2013
S4 - E14Kill House Feb. 05, 2013
S4 - E15History Feb. 19, 2013
S4 - E16Lohkay Feb. 26, 2013
S4 - E17Wanted Mar. 05, 2013
S4 - E18Red (1) Mar. 19, 2013
S4 - E19Red (2) Mar. 26, 2013
S4 - E20Purity Apr. 09, 2013
S4 - E21Resurrection Apr. 23, 2013
S4 - E22Raven & the Swans Apr. 30, 2013
S4 - E23Parley May. 07, 2013
S4 - E24Descent May. 14, 2013