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Editors’ Note, Oct. 6: After this article was published, the chief executive of Konnech, Eugene Yu, was arrested in connection with an investigation into the possible theft of personal information about poll workers. In communications with The Times for this article, neither Mr. Yu nor a spokesman for Konnech said that the company was the subject of an investigation. They also asserted that all the company’s data was stored on servers in the United States; prosecutors in Los Angeles, who brought the charges against Mr. Yu, said that they had found some company data stored on servers in China. The Times is continuing to report on this story.