The U.S. Supreme Court declined on Monday to hear a second Illinois case challenging the state’s ban on semiautomatic weapons, which took effect Jan. 1. Decatur Republican state Rep. Dan Caulkins appealed last summer’s ruling by the Illinois Supreme Court upholding the prohibition on handguns and rifles of the type used in the 2022 Highland Park Independence Day parade shooting that killed seven and injured more than 30. Under the ban, no one may possess or manufacture nearly 200 types of the firearms or accompanying high …