Feb 26, 2009 Adopted APPENDIX TO CHAPTERS 18 TO 20. THE COLORADO RULES OF PROFESSIONAL CONDUCTColo. RPC 1.0. TerminologyColo. RPC 5.4. Professional Independence of a lawyerAmended and Adopted by the Court, En Banc, February 26, 2009, effective immediately. Download the rule change (PDF, 14.65 KB)