Colo. Const. art. XXVI, § 4
This article shall be in all respects self-executing; but, the general assembly may by law provide for its more effective enforcement and may by law also impose additional restrictions or conditions upon the emplacement or detonation of any nuclear explosive device.
Source: L. 74: Entire article was added, effective upon proclamation of the Governor, December 20, 1974, but does not appear in the session laws.