Indiana Code Title 35. Criminal Law and Procedure § 35-31.5-2-261

(1) is authorized to perform an official function on behalf of, and is paid by, a governmental entity;

(2) is elected or appointed to office to discharge a public duty for a governmental entity;  or

(3) with or without compensation, is appointed in writing by a public official to act in an advisory capacity to a governmental entity concerning a contract or purchase to be made by the entity.