Colo. Rev. Stat. § 25.5-10-217
All court proceedings arising under section 25.5-10-216 shall be conducted by the district attorney of the county where the proceeding is held or by a qualified attorney acting for the district attorney appointed by the district court for that purpose; except that, in any county or in any city and county having a population exceeding one hundred thousand persons, the proceedings shall be conducted by the county attorney or by a qualified attorney acting for the county attorney appointed by the district court. In any case in which there has been a change of venue to a county other than the county of residence of the respondent or the county in which the proceeding was commenced, the county from which the proceeding was transferred shall either reimburse the county in which the proceeding was held for the reasonable costs incurred in conducting the proceeding or conduct the proceeding itself using its own personnel and resources, including its own district or county attorney, as the case may be.
C.R.S. § 25.5-10-217
This section is similar to former § 27-10.5-111 as it existed prior to 2013.