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Blood screening
A blood screening reveals a Changeling.
DS9 ForeverAdded by DS9 Forever

Blood screening was a procedure that was attempted by Starfleet in the 2370s, to detect Changelings by drawing blood from an individual. When a Changeling's matter is removed from its body, it reverts to its gelatinous state, giving the Changeling away.

The procedure was first suggested by Constable Odo in late 2371, when a Changeling hijacked the USS Defiant and attempted to use her to start a conflict between the Federation and the Tzenkethi. Unfortunately the procedure failed, as the Changeling posed as Dr. Julian Bashir, who was performing the blood screenings. (DS9 episode: "The Adversary")

By 2372, the procedure was standard across all Federation starships, and all crew and passengers were subjected to blood screenings on a regular basis. In 2372, the Changeling posing as Lieutenant Linda Addison was able to get around the blood screenings by absorbing a sample of Addison's blood that it kept in her quarters aboard the USS Enterprise-E. (TNG eBook: A Sea of Troubles)

Following the rescue of the Detapa Council, the crew of Deep Space 9 conducted blood screenings to ascertain if the Klingon claim they had been replaced by Changelings was right. The crew found this was not the case. (DS9 episode: "The Way of the Warrior")

Blood screenings became common on Earth when Jaresh-Inyo declared martial law. (DS9 episodes: "Homefront", "Paradise Lost")

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