. >> reporter: in january the nra filed suit against those three cities, lan caflt philadelphia and pittsburgh, goldstein said the central issue resolvedrevolved around an issue. >> notion of preemption is a part of our law in pennsylvania that prohibits municipalities from passing local regulations of firearms. it is a set of regulatory powers that the general assembly has reserved to itself. act 192 was designed to bring more force to that preemption. >> reporter: but pennsylvania's law 192 may be subject to constitutional challenges. philadelphia pittsburgh and lancaster argued that the measure passed in 2014 was illegally tagged to a bill on scrap metals. >> you're going to have your fee covered either way. >> well, if the law is found unconstitutional our fees are not covered. doesn't mean it's not right many municipalities across pennsylvania heeded the warning and withdrew these illegal ordinances. lancaster, philadelphia and pittsburgh think they have some special knowledge do so at their taxpayers pearl. >> do you think they are scared of the nra? >> i think they did so because they l