NCIS: Los Angeles › Season 4

S4 E20: Purity

Name: Purity
Released: 2013-04-09

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.

Air date	Apr 9, 2013
Runtime	44 minutes
TMDB rating	★ 7.2/10