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Optical scan IS better because there IS a voter verified paper ballot, BUT (and it's a BIG but) the benefit of the paper ballot is only gained if the recount is done by hand.
DO NOT RELY ON A RE-SCAN OF THE BALLOTS, COUNT THE PAPER ORIGINALS BY HAND
If there is any question as to the accuracy of the machine's interpretation of the first scan, there is NO reason to believe that the machine's interpretation of a second scan would be any more accurate.
You see, the scanner only looks for a dark mark at a particular spot on the paper. If the voter has placed an X through the bubble or circled the bubble or made some other indication of intent, the machine will NOT see it, nor recognize it.
These are not scanners like you can get for your home or office PC, they DO NOT take an image of the entire page. They 'see' ONLY the areas where the bubbles (or broken lines) are, and all they do is register a 'darker than the paper' or 'same as the paper' response for each target area. Depending on the type of light source that the scanner uses (many use infrared light) the type of writing utensil is important. Some writing utensils do NOT register under infrared, because they don't absorb enough of the infrared light. That's why #2 pencil is required - the graphite/ carbon content absorbs the infrared and the sensor in the scanner doesn't get as much reflected back as it does when it 'sees' the blank paper.
The same is true with the visible light scanners. Depending on the color of the light (often red) certain inks don't respond as well.
This is also why the type of paper is important. Some papers reflect the light more or less than others. So if your county or precinct ran out of ballots and got extras photocopied, unless they were done on the correct paper, the results could easily be influenced.
Speaking of photocopies, you know the black stuff that flakes-off from a photocopied document? It's called toner and is usually carbon based - which absorbs infrared.
Some counties use their Central Tabulator to print-off 'ballot images' for the recount. They think they're getting a nice clean copy of each scanned ballot. What they're ACTUALLY getting is a piece of paper formatted to look just like a ballot, with the machine's interpretation of the voter's intent printed into each bubble. Yea, it's nice and clean, but it hasn't been verified by the voter. All it is, is a re-print of the interpreted results.
There are a number of other things that can easily influence the outcome with optical-scan ballots, but a hand count of the original ballots will solve those issues, too.
DO NOT RELY ON A RE-SCAN OF THE BALLOTS, COUNT THE PAPER ORIGINALS BY HAND
And now you know the rest of the story.
HG ;-)
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