Z:gnu-www-ja-free-digital-society--4eadf3-How can you tell if a voting m/en

How can you tell if a voting machine will honestly count the votes? You'd have to study the program that's running in it during the election, which of course nobody can do, and most people wouldn't even know how to do. But even the experts who might theoretically be capable of studying the program, they can't do it while people are voting. They'd have to do it in advance, and then how do they know that the program they studied is the one that's running while people vote? Maybe it's been changed.