A Pennsylvania court is narrowing a state law, regarding the purchase and use of powerful fireworks. Commonwealth Court ruled that lawmakers improperly delegated their authority by imposing safety standards set by an outside group, in violation of the state constitution. The judges invalidated the portion of the law that addressed sales from roadside tents and similar temporary structures, but left intact the rest of the law. That means sales of Roman candles, bottle rockets and other airborne fireworks will continue at the state's brick-and-mortar fireworks stores. The 2017 law's 12 percent tax will also remain in place.