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.
C.R.S. § 2-2-313
For the authority of legislative council to compel attendance of witnesses and procedure therefor, see § 2-3-306; for the authority of the legislative audit committee to subpoena witnesses, see § 2-3-107; for fees and expenses of witnesses in civil cases, see §§ 13-33-102 and 13-33-103; for intimidation of legislative witnesses, see § 8-2.5-101.