Has there been any proven results of this working successfully in RL? Section 2, Clause 4 causes concern for me - we are basically admitting that this might cause equipment malfunction, so what happens in that case? The vast majority of ballots in the US are either electronic or scanned and I expect the number to only increase in the future. Is the vote just not counted? I'd rather err on the side of caution to ensure that every person's vote is counted.
I would also like to raise the possibility of varying degrees of adhesive that come with stickers. We are bound to see some stickers falling off, even causing separate ballots to stick together, not unlike the pages in the right honorable gentleman's favorite pornography magazine!