C.R.S. § 20-1-106: Appear and advise grand juries.

The district attorneys for the several judicial districts in the state of Colorado shall appear in their respective districts at all sessions of any grand jury which may be convened in any county within their respective districts, and it is the duty of the district attorney to advise any grand jury convened within his district and to examine witnesses who may be subpoenaed before any such grand jury.