A chef finds a naked sailor inside a freezer in the galley at a restaurant in Rota, Spain, during a port visit by USS Enterprise (CVN-65); shortly afterward at sea another petty officer freaks out on the flight deck. Each of them tests positive for meth, even though each of them recently passed their random drug tests; soon one of them dies in the sickbay, apparently by homicide. The resident NCIS special agent aboard the ship calls for Gibbs and his team; they all investigate, and, with the help of Abby and Ducky, back at the Navy Yard in Washington, they discover both the answers and the unlawful system not only providing the illicit drug to innocent users but also rigging the test results.
—DocRushing