[mylife]

If the optical reader scans it how does it know you used a sharpie?

I think some one is sniffing sharpies.

[Jonny7797]

I believe what I heard was poll workers gave out sharpies to use on in person voting and someone challenged that. The ballot says only black pen is allowed.

[shotgun]

They bleed through the paper. However I heard that Arizona solved that problem and Sharpies, by law, are now okay to use. I think what their trying to get across is local precincts are now applying the old bleed through argument to reduce the Trump vote.

[lepton]

If the optical reader scans it how does it know you used a sharpie?

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By seeing marks outside the boxes (like from the back side)