Tampering with election systems and equipment

Voting machines, tabulators, ballot printers, voter registration systems, or election networks are hacked, altered, or accessed without authorization. Confirmed compromises of US election equipment are rare, and most reported problems trace to setup, calibration, or user error. This threat moves only on a confirmed intrusion, an official finding of tampering, or a documented breach of access rules. Unsupported hacking claims are tracked as rumors.