Since September, when DeCamp took over as the lead investigator, the effort has scrutinized 245 individual voters. Of those, more than 80 have been referred to county attorneys for possible prosecution.
It will be up to prosecutors on whether to bring charges based on the evidence provided by the DCI.
Since the investigation began in July, 2012, five cases have resulted in guilty pleas. Fifteen are pending before courts across the state, DeCamp said.
A Des Moines Register investigation into the five guilty pleas last December revealed they generally involved voters who didn’t intentionally violate state election laws.