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A Navy lieutenant dies and a pilot is hospitalized after they both drink from a communal water jug that is laced with cyanide. The team investigates to determine whether it is an isolated incident or an early test for large-scale water contamination.
Kensi and Deeks are sent to Mexico to investigate the theft of a cartel boss's body, after a DEA special task force brings the ruthless criminal down. Back at home, Callen and Sam look into whether there is a leak in the DEA.