A nonprofit organization and voters battling the state for a return to paper ballots claim they have uncovered evidence that ballots cast on the state's obsolete electronic voting machines are not secret, according to court papers filed Friday.

In a new motion for a preliminary injunction, attorneys for the Coalition for Good Governance and several plaintiff voters have asked a federal judge in Atlanta to sideline use of the state's obsolete electronic voting machines after Oct. 1.

The plaintiffs claim that evidence obtained from state and county election officials revealed that a “unique identifier” is attached to each electronic vote cast on the 17-year-old machines. Those unique identifiers could enable “election insiders or malicious intruders” to connect each ballot to the voter who cast it, the motion contends.