Medical marijuana is very popular in Pennsylvania. However, getting a medical marijuana card effects your Constitutional Right under the Second Amendment.
A lot of citizens avail themselves to the benefits of medical marijuana instead of traditional opioid therapy. One aspect that you need to understand is that you will not be able to receive a gun license per 18 Pa.C.S.A. 6109(e)(1)(xiv), which relies and refers to Federal Law. Marijuana is not legal under Federal Law, and, therefore since this section of the statute relies on Federal Law, it applies to you, here in Pennsylvania.
This is only one example of how the advent of medical marijuana operates in a counter-intuitive way. (Another example would be the fact that your medical marijuana card does not absolve you of facing a drug-dui as of yet. Blog to come later.) So, if you are a gun owner, or plan to be one, think twice before getting that medical marijuana card.
For the Pennsylvania State Police’s official position, see here. On that webpage the Pennsylvania State Police link to a letter from the United States Department of Justice, Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), also linked here, for your convenience.