Voter fraud doesn’t happen, except when it does. Several thousand times.

Thousands of foreign citizens — particularly in South Florida — might be registered to vote in Florida and could have unlawfully cast ballots in previous elections.

The potential problem is largest in Florida’s largest county: Miami-Dade, where the elections supervisor is examining 2,000 potentially unlawful voters, WFOR-CBS 4 News reported Tuesday. Broward is examining 260 suspected foreign voters. One suspected noncitizen voter has been registered for about 40 years, CBS 4 found.

Over the past year, the Florida Division of Elections has begun identifying potential foreigners on the rolls in coordination with the Department of Highway Safety and Motor Vehicles, Division of Elections spokesman Chris Cate told The Miami Herald. He said the state has forwarded the names to county elections supervisors, who are in charge of the rolls.

“There will be more names,” Cate said.