Pennsylvania is struggling with the legalization of medical marijuana and the Federal prohibition of marijuana use.The state police have quoted federal law as prohibiting people who legally use marijuana under state law, from purchasing firearms under federal law. Medical marijuana users may be denied a Pennsylvania license to carry firearms. From the Pennsylvania State Police website: If you are holder of a Medical Marijuana Card, it is important that you know: It is unlawful for you to attempt to purchase a firearm under Federal law and you will be denied during your Pennsylvania State Police background check, due to...