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"I noticed that almost all of the ballots I reviewed were for Biden. Many batches went 100% for Biden. I also observed that the watermark on at least 3 ballots were solid gray instead of transparent, leading me to believe the ballot was counterfeit. I challenged this and the Elections Director said it was a legitimate ballot and was due to the use of different printers. Many ballots had markings for Biden only, and no markings on the rest of the ballot."
edit: doh! I accidentally her name /shame
No, that would be silly (I know you were being a bit hyperbolic there). But one method of fraud would be to stop the counting in the night, print up your own emergency set of ballots, and then dump them. Your own set may not be likely transparent/embossed watermarks or use the identical paper that the ballots use if you hadn't been prepared for this emergency. It could still have a legitimate explanation of course, something wrong with the printer etc etc.