I drove my brother to Johns Hopkins when he was very ill and I carried, I actually had my Springfield XD9 in my lap when I pulled to the curb to ask a policemen for directions. I was kind of freaked out later, when I found out having my pistol was illegal
either the officer didn't see it, which I doubt or he just let me go
Baltimore has some pretty dumpy areas, abandoned homes etc, please be aware of your surroundings. Around the hospital is a very rough area.