The issues of justification or exemption from criminal liability under sections 18-1-701 to 18-1-709 are affirmative defenses.
C.R.S. § 18-1-710
For the affirmative defense of impaired mental condition, see §§ 16-8-103.5 and 18-1-803; for other provisions concerning affirmative defenses generally, see §§ 18-1-407 and 18-1-805; for affirmative defenses to particular crimes, see specific criminal provisions in articles 2 to 18 of this title 18.