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What is the difference between DRE and Optical Scan machines?

April 26, 2017difference DRE machines optical scan

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What is the difference between DRE and Optical Scan machines?

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On DRE machines, the voter indicates his or her vote, either by using an ATM-style touch screen, pressing buttons, or turning dials on a computer device. Optical scanners use paper ballots that voters mark (or, in some cases, a machine generates) by filling in appropriate bubbles; voters then feed the completed paper ballots into a scanning device that records and counts the votes.