Take the lenses out then just spray them with a can of tint spray. Apply light coats until you get them as dark as you want. Just dont overspray because it will run, then you must start over. And dont sand down the lens, unless you want it to be permanent. I dont know the inspection rules in MD, but if you clean it with rubbing alcohol, let it dry, spray the tint on, and you would end up getting a fine for some reason, the film can be peeled off similar to window tint.