Even if you don't live in Maryland, there's a good chance you've heard about how dangerous Baltimore City is. Often making the national news about violence, Baltimore stands as a testament to failed liberal policies, especially on the subject of gun control.
We often use Baltimore as a great example of how gun control has little to no effect on violent crime in the firearms world. This is ironic because Maryland law is a gun control advocate's paradise, receiving an "A-"from Giffords on their annual "Gun Law Scorecard." Giffords also ranks Maryland 6th for "strong" gun laws in the country. Here in Maryland, we have the whole package; an assault weapons ban, licensing requirements, training requirements, a registry for handguns, and to cap it all off; Maryland is a "May Issue" state.
For those living in Free America, a "May Issue" state is where the burden is on the citizen to prove why they should be allowed to have a concealed handgun permit. You'd need to provide a good and substantial reason why you should be "allowed" to exercise your right. Often, "self-defense" is not an acceptable reason for the permit because these licensing schemes exist only as a gatekeeping method for the elite to keep firearms out of the hands of the average citizens that need them.
On the other side, in free states, the burden is on the state. Shall Issue makes better legal sense because, just like in the court system where your innocence is assumed, you can carry a firearm if you pass a background check.