There are NO secure and verifiable electronic voting systems. All of them have flaws, back doors, defects, and vulnerabilities. The only even vaguely secure voting system is PAPER ballots. Every voter should mark a PAPER ballot. (If somebody wants to design a voting machine that then prints out a PAPER ballot to be verified by the voter, I suppose that would be OK.)
Paper ballots, unlike electronic ballots, can be re-counted. They can be examined for signs of tampering. Once the ballot is marked, it can be scanned and electronically counted. After the election has been certified, THEN the ballots can be destroyed.
And every poll worker must be required to certify that EVERY ballot has been sent in to the County Board of Elections; any "boxes of ballots" that appear the next day, a la Al Franken, should earn a LONG jail term for the poll worker responsible.