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A thumbscan was a biometric identification consisting of an image of an individual's thumbprint. The process of obtaining this image was also called a thumbscan. It was often used to record an individual's participation in a contract, presence at an event, or acceptance of an agreement.
In early 2370, a Cardassian Gul's thumbscan on a Kressari PADD proved adequate evidence to show a connection between Cardassia and The Circle — immediately ending that organization and toppling the political career of its leader, Minister Jaro Essa. (DS9: "The Siege")