Cylon detector
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A Cylon detector is a scientific method of determining whether a subject is human or a humanoid Cylon.
Created by Dr. Gaius Baltar, the test is administered by subjecting a person's blood to plutonium embedded in a carbon nanotube matrix. A filter preferentially ionizes synthetic molecules; this is because Cylons are susceptible to certain kinds of radiation. The plutonium was taken from one of Galactica's nuclear warheads, at the suggestion of Number Six (Bastille Day). The test results are simple: either "red", indicating Cylon, or "green", indicating human. Yet with a single test cycle lasting approximately eleven hours, Baltar estimates it will take over 60 years (not counting breaks for sleep, food, bathroom, etc.) to test the whole fleet (numbering almost 50,000 people) (Tigh Me Up, Tigh Me Down).
Development work on the Cylon detector had previously been halted when Dr. Baltar was accused by Shelly Godfrey of being a traitor and temporarily thrown in the brig (Six Degrees of Separation). Baltar's "innocence" was proven, however, by Lieutenant Felix Gaeta, who had previously been ordered by Commander Adama to assist Baltar in the development of the device (Water). Although considered a military secret, the Cylon detector is nevertheless the subject of constant rumor and innuendo (Act of Contrition).
Curiously, it may be the Cylons themselves (in the form of Virtual Six) are the ones who initially suggest the construction of the Cylon detector by using the nuclear materials. Moreover, Baltar was only put in charge of the project because of his earlier detection of the fleet's first Cylon infiltrator, Aaron Doral, which was also greatly influenced by Number Six (Miniseries). Therefore, the irony is that the Cylon detector may very much be a product created by the Cylons through Baltar.
The Cylon detector does work. It confirms that Sharon Valerii is indeed a Cylon—a fact that Baltar hides from Valerii, fearing what her Cylon persona would do were he to tell her (Flesh and Bone). After discovering that it would be easier for Baltar to make all the results "green", Baltar alters the device to mimic his method of thinking (Tigh Me Up, Tigh Me Down). However, after Sharon Valerii shoots Commander Adama, everyone believes the Cylon detector to be a failure, thinking that it didn't pick up her Cylon nature.
Notes
- Its effectiveness in detecting the "fundamentally different" Final Five is unknown, since it is not known whether or not not Baltar's detector was ever used to test any of the revealed Five.
- Presumably, Baltar's detector was abandoned due to the fallout from his cooperation with the Cylons on New Caprica and the ruling from his controversial trial after being recaptured by Galactica's personnel.
- The Lymphocytic encephalitis virus is accidentally discovered as fatal to humanoid Cylon physiology but harmless to humans (A Measure of Salvation). While this revelation could be used as a future detector, there have been no indications of research in this direction.
- Although use of the Cylon detector is somewhat implied in "Hero" and "He That Believeth Me", dialogue only states that Dr. Cottle compared the DNA of Bulldog and Kara Thrace, respectively, with their records.