In Canada, we still use the ballot and paper. It is designed for polls workers to watch each other.
Yes, it is possible for poll workers to cheat a little. But then the final tallies would be out. An investigation would be warranted--and people could be thrown in jail.
I don't know exactly how the American system with machines work, but I'm pretty the procedures have been well honed.
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If the Republicans are so worried about stealing, then why are their scrutineers not wearing body cameras in their rightful vigilance of the process?
<rhetorical question>