Colorado constitution
Article XII
Section 5

The district court of each county shall, at each term thereof, specially give in charge to the grand jury, if there be one, the laws regulating the accountability of the county treasurer, and shall appoint a committee of such grand jury, or of other reputable persons not exceeding five, to investigate the official accounts and affairs of the treasurer of such county, and report to the court the condition thereof. The judge of the district court may appoint a like committee in vacation at any time, but not oftener than once in every three months. The district court of the county wherein the seat of government may be shall have the like power to appoint committees to investigate the official accounts and affairs of the state treasurer and the auditor of state.