Indiana Code Title 3. Elections § 3-11-15-39

Sec. 39. The electronic voting system firmware instructions must contain necessary logical instructions to determine correct recording of each and every candidate or public question selection made by the voter to the appropriate memory registers and tables.  In the case of a partially voted ballot, deliberate undervoting by a voter must be permitted.  This undervoting must be validated by machine determination that particular candidate or public question selections have not been made.  In cases where a selected candidate or vote on a public question is not recording correctly upon casting of the ballot, the electronic voting system equipment must generate an error signal and automatically stop operation of the machine until the problem is resolved.