Absentee/mail-in ballot fraud includes forging or submitting invalid ballots. Studies indicate low risk, with benefits for voters; fraud is rare and punishable. Heritage lists cases, but Brennan notes security features like signatures. In 2025, Supreme Court case on post-Election Day ballots affected states like Washington. Conspiracy theories persisted despite no evidence of widespread fraud.

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Warnings and Prevention Tips: Use drop boxes or mail early; track ballots via state portals. Helpful information: Avoid unsolicited ballot help; report to FBI at 1-800-CALL-FBI.