Arizona election officials confirmed that Sharpies were used in voting, but they said that would not invalidate a ballot. The Maricopa County Elections Department tweeted on Election Day that voting centers use Sharpies so that ink does not smudge when ballots are counted.
https://apnews.com/article/claim-sharpie-pens-ruin-arizona-ballots-f5287df8fdb2be101b2cdf9edd007746

