Nothing is going to measure pencil marks perfectly, but scantron technology is decades old. Sloppy pencil usage wouldn't inhibit manual inspection of paper bal

Nothing is going to measure pencil marks perfectly, but scantron technology is decades old. Sloppy pencil usage wouldn't inhibit manual inspection of paper ballots, e.g. during a recount, but one does have to define some expected threshold of competency for voters using the ballots.