The Boulder, Colorado supermarket shooting that left 10 people dead on Monday has put a spotlight on a recent court decision that blocked the city from enforcing a ban on assault weapons and large-capacity magazines. Boulder County District Judge Andrew Hartman on March 12 agreed with plaintiffs that Boulder’s ban on possessing and transferring commonly-possessed “assault weapons” and ten-round magazines were not allowed under city law, effectively overturning the ban. He wrote in his order (pdf), “The Court has determined that only Colorado state (or federal) law can prohibit the possession, sale, and transfer of assault weapons and large-capacity magazines.” The ordinances that Hartman overturned in his ruling were passed by Boulder City Council after the mass shooting at Marjory Stoneman Douglas High School that left 17 dead in Parkland, Florida. The alleged shooter arrested on Monday had purchased an assault weapon he used in the shooting just six days prior, …