New Gun Laws Take Effect in Colorado, Challenged in Missouri

Colorado has lifted restrictions on local firearms ordinances, a move that goes counter to the choices made in other states with new gun laws.

The Colorado measure (S.B. 256), which took effect over the weekend, repealed a preemption on local gun restrictions imposed after the 1999 Columbine High School massacre, in which 12 students and a teacher were murdered. The new statute gives cities and counties the authority to be more restrictive than statewide laws.

Boulder Mayor Sam Weaver said his city will work to reinstate its ban on assault-style weapons like the AR-15-style pistol used in the ...