Kansas Secretary of State Kris Kobach says he'll start prosecuting people for voter fraud next month and will focus on cases of double voting. Kobach says his office has been working with other states to get documents to support claims of multiple voting. He says there are plenty of cases to investigate. "It happens with great regularity." Kobach said. "In a typical year there will be somewhere around a dozen people who will vote both in Kansas and in some other state around the union.” But U.S. Attorney for Kansas Barry Grissom disputes those figures. He says such cases are very rare and, when they occur, are honest mistakes and don't rise to the level of voter fraud. "It's like point-zero-zero-zero-zero-nine percent." Grissom said. "The medicine for the supposed ill is killing the patient because the patient isn't ill." Critics say Kobach's effort is more about suppressing voter turnout than prosecuting legitimate offenders. Kansas lawmakers gave Kobach the power to prosecute voter fraud this year. Kobach told the legislature that local prosecutors were not vigorously pursuing cases of election fraud.