All this information from my reading a few years back of the 3 election volumes of the California State Code. Surely the first principle ought to be the protection of secret balloting rather than the promotion of the possible convenience of computerized vote-counting. Suppose an electronic voting booth, with a screen and some sort of simple keyboard. In effect, a menu-driven ballot on the screen. The voter fills in his or her choices and has a chance to go back and correct errors.
Voter scans the printed card and is asked whether it is accurate.
The voter takes the card out of the booth and drops it in a ballot box. This system would permit absolute secrecy for the individual voter, who could not be traced to the card or the electronic vote. But the cards would be in a ballot box, where they could be counted by hand. After the election, a representative random sample of precinct boxes would be counted by hand, and matched to the electronic tally, just to audit accuracy. And in the case of a re-count, the entire election result could be counted by hand.