C.R.S. § 23-22-109

If any person has been admitted to the hospital as a voluntary patient, the director of the hospital has the same authority and control over the patient as if the patient had been admitted by order of court; except that a voluntary patient must not be detained against the patient’s will or that of the person having legal custody or control over the patient for more than ten days unless the hospital director has within such interval obtained an order of certification for the patient.