The Secretary of State's office received complaints from voters who couldn’t find their registration information or found their information had been changed.
Indiana State Police says voter suppression and civil rights violation allegations against the department are completely false.
The Indiana State Police investigation is looking into whether fraudulent names or addresses were used in registering voters.
The group has asked the U.S. Department of Justice to look into whether Indiana officials have tried to suppress black votes.
Investigators believe more than 100 voter registration forms could have been compromised.
The forms were among thousands submitted by the Indiana Voter Registration Project in Marion and Hendricks counties.
Charlie White is appealing his February 2012 conviction on charges of voter fraud, perjury and theft that came a year after he was elected Secretary of State.
Secretary of State Charlie White is not being required to serve his one-year home detention sentence while he appeals convictions of voter fraud.
Charlie White's attorney is arguing his previous attorney did not properly defend him because he did not allow White to take the stand.
Legislators in some states are pointing to Indiana’s law as an example of a strict photo voter ID law.