It's true that optically scanned cards don't prevent questionable votes; however, predetermined policies can be put in place to handle such issues such as improperly erased and partially filled in circles. It hardly seems worth trading a system with good auditability for one with limited auditability. If our representatives can't come up with a way to handle such issues, then the politicians need to be decommissioned, not the optical scanners.
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It's true that optically scanned cards don't prevent questionable votes; however, predetermined policies can be put in place to handle such issues such as improperly erased and partially filled in circles. It hardly seems worth trading a system with good auditability for one with limited auditability. If our representatives can't come up with a way to handle such issues, then the politicians need to be decommissioned, not the optical scanners.