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Za'tarc detectors are devices used by the Tok'ra to identify Za'tarcs. Developed by Anise, the devices use a memory recall device in concert with an eye scanner of sorts. It works by comparing the subconscious memory to the conscious memory, even if the person consciously believes that they are telling the truth. This exposes the false memories implanted by Goa'uld to cover up the time in which a person was made a Za'tarc. (SG1: "Divide and Conquer", "Allegiance")
The device has been able to give false positives, especially if the subject being scanned is agitated or aggressive. This was seen when Ocker was scanned, when highly agitated by his recent confrontation with the Tok'ra. The machine will register the person a Za'tarc also if you are consciously lying about something. (SG1: "Divide and Conquer", "Allegiance")
- The design of the Za'tarc detector is similar to the Voight-Kampff Machince from Blade Runner. They also both detect Za'tarcs/Replicants by scanning the eye of someone and analyzing physical responces to questions.