sentences:  These courts have heard lawsuits in regard to bans of firearm possession by felons, drug addicts, illegal aliens, and individuals convicted of domestic violence misdemeanors.Also, cases have been heard on the constitutionality of laws prohibiting certain types of weapons, such as machine guns, sawed-off shotguns and/or specific types of weapons attachments.In addition, courts have heard challenges to laws barring guns in post offices and near schools and laws outlawing "straw" purchases, carrying of concealed weapons, types of ammunition and possession of unregistered firearms.