C.R.S. § 2-2-313
2-2-313. Witnesses - attendance before assembly
2-2-313. Witnesses - attendance before assembly. The general assembly, or either house thereof, by resolution or otherwise, as it deems best, may prescribe the conditions under which and the manner in which a witness may be summoned to attend, with or without documents in his possession or under his control, before any committee of said general assembly or of either house thereof.