I suppose the explanation is that there's not enough money to be made from providing pencils and sealable boxes with slots in the top.
If you're designing a security bug bounty for your organization's products, by all means get the lawyers to take a look, but keep their hands off the keyboard. If it's one thing flaw-finders find too tedious to deal with, which will put them off finding holes in your defenses, it's legalese – and these are people who otherwise …
Where I vote when they give you a paper ballot (which has bubbles you fill in and are read by an optical scanner) they put a little barcode sticker on it. So long as they keep the supply of those barcode stickers secure, they can identify any "ballot stuffing" and since they have a count of how many stickers have been used any loss/destruction of ballots.
More importantly, paper ballots can be recounted so even if someone compromises the systems doing the scanning, or the tabulation of precinct results on a statewide basis, so if some simple rules around verifying the counts are followed hacking those computers can't change the result.
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