Indiana Code Title 2. General Assembly § 2-4-1-1

Sec. 1. Whenever pursuant to a resolution of the general assembly or either house thereof and pursuant to the authority vested in the general assembly or either house thereof an investigation is instituted in aid of its proper legislative functions, the house of representatives or the senate, or any committee of either or of both of said houses to which the duty of said investigation shall be entrusted, shall have the power to subpoena witnesses, send for and compel the production of books, records, papers and documents.