One recent case of alleged absentee-ballot fraud happened this past summer in Hialeah, Fla., outside Miami. Police say they were trailing a woman suspected of ballot fraud and saw her enter a nursing-home room.

The patient inside was too ill to write, speak or comprehend what was said to her. But somehow, police said, the worker left her room with a completed absentee ballot.

Read More: Selling votes is common type of election fraud – The Washington Post