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(Greater Dakota News Service) Just a few months after some South Dakota absentee ballots were illegally challenged, officials are concerned slow mail delivery could affect outcomes on Election Day.

Members of the National Association of State Election Officials have sent a letter to the U.S. Postmaster General, expressing concerns about Postal Service performance over the last year. It cited patterns of inconsistent training among staff, lengthy delivery times and a rise in mail returned as undeliverable, which can affect a voter's registration.

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Samantha Chapman, advocacy manager for the ACLU of South Dakota, hopes election officials across the state are educating people who request absentee ballots.

"About the possibility of delayed mail service and the importance of expediently filling out those ballots and mailing them back as soon as possible," Chapman stressed.

Chapman encouraged South Dakotans to check the status of their voter registration in case they have been purged through routine maintenance or other changes. The registration deadline is Oct. 21.

A challenge to some absentee ballots cast during the June primary in Minnehaha County nearly caused 100 to be rejected, in a race where candidates were separated by just 83 votes, according to the ACLU. The South Dakota Secretary of State's Office advised state law did not deem the ballots challengeable.

Chapman hopes there are no similar issues on the upcoming Election Day.

"We really, really, really are pushing all of our election administrators to follow the laws that are in place," Chapman explained. "And to use their positions to be an accurate source of information for voters."

The U.S. Postal Service last month proposed a plan to adjust mail delivery starting next year to increase reliance on regional hubs, which could slow delivery to rural areas. It is estimated the plan will save the service $3 billion per year.