US voter roll flaw registered 30,000 non-citizens across 12 states over 20 years

A structural flaw in US voter registration systems has led to approximately 30,000 non-citizens being registered to vote across at least 12 states over two decades, according to an investigation. The issue appears to be an unintentional administrative error rather than organized fraud, but the scale and duration raise concerns about electoral integrity. The mechanism behind each case has been reconstructed, though the full impact on past elections remains unclear.