Indiana Code Title 4. State Offices and Administration § 4-4-2-1.1

Sec. 1.1. Whenever the lieutenant governor transmits to the governor the lieutenant governor's written declaration that the lieutenant governor is unable to discharge the powers and duties of the lieutenant governor's office, and until the lieutenant governor transmits to the governor a written declaration to the contrary, the powers and duties shall be discharged by a person appointed by the governor as acting lieutenant governor.  Thereafter, when the lieutenant governor transmits to the governor the lieutenant governor's written declaration that no inability exists, the lieutenant governor shall resume the powers and duties of the lieutenant governor's office.