I will be driving through Maryland from Florida to Pennsylvania and returning about a week later. I have a Florida Concealed Weapon Permit. I intend to carry by CCW. How or what should I do to remain legal in MD? I have two concerns: First, MD does not recognize FL CC Permit, and it seems like merely driving through is a problem. Second, the MD law excludes possession of a handgun from those habitual users of narcotics. It does not say the "illegal" use. My wife takes a very low dose prescribed by a doctor. She never drinks. Has never smoked a joint, drank a can of beer or used illegal drugs, ever! She is always a sober as anyone can ever be. What of medications prescribed by a physician? Is this an issue in other states? I think even the form we sign to purchase a firearm only bars the purchase by people with illegal drug issues? Any advice?