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The Voight-Kampff machine is a fictional interrogation tool, originating in the novel where it is spelled Voigt-Kampff. The Voight-Kampff is a polygraph-like machine used by Blade Runners to determine whether an individual is a replicant. It measures bodily functions such as respiration, blush response, heart rate and eye movement in response to questions dealing with empathy. In the film two replicants take the test, Leon and Rachael, and Deckard tells Tyrell that it usually takes 20 to 30 cross-referenced questions to distinguish a replicant; in contrast with the book, where it is stated it only takes “six or seven” questions to make a determination. In the film it takes more than one hundred questions to determine that Rachael is a replicant. • Also buy this artwork on apparel, stickers, phone cases, and more.