Can Nevada voters trust voting machines to prevent election

What makes the county registrar feel confident vote totals have not been kept the same but some votes have been shifted from one candidate to another?

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Nevada , United States , Washoe County , Bethany Drysdale , Mark Robison , Mark Robison Reno , Registrar Of Voter Office , Reno Gazette , Homeland Security , Infrastructure Security Agency , System Testing , Reno Gazette Journal , Fact Checker ,