The resident, who said he moved into the home last year, told local television station KSNV that he assumed the ballot was his. He had voted in June’s primary without a problem and had signed up for Nevada’s ballot-tracking service, he said. He noticed the name mismatch as he prepared to return the ballot.

“I literally filled the entire ballot out, was ready to put it in the envelope,” he said, adding that he had signed it before seeing the other person’s name. He said the ballot carried his address, rather than simply having been delivered to the wrong location.

Nevada voters can track their own ballots through the state’s MyBallot system. The state also directs voters who have not received a ballot to its voter-registration site, where they can confirm or update an address or request a replacement. The voter said he wanted clearer instructions on what to do when a ballot arrives in someone else’s name.

Mail voting has become a major part of Nevada elections, said Jon Ralston, CEO of The Nevada Independent. He estimated that 80% to 85% of votes would be cast before Election Day, citing mail voting and the start of in-person early voting on Saturday. Election Day is Nov. 3.

Nevada law makes voting more than once in the same election a category D felony. Attorney Thomas Boley said intent matters and that criminal liability generally arises when someone attempts to cast more than one ballot. The report did not establish whether the voter returned the ballot or what steps he took after discovering the error.

Clark County Elections had been contacted for comment, but no response was reported at the time.