First I want to say I am glad your son is doing well. I had a similar experience at Plano Medical Center. I was in and out of the emergency room exit a dozen times or more over a couple day period. Never saw a sign. Then I noticed the 30.06 sign on the revolving door. I was looking for it on each side of the door and since the door was moving, had not noticed it. That was not the first time I found myself carrying where I was not suppose to be. I was in a hotel in Austin that was not posted at the garage entrance. It was plainly posted at the other entrances. Made no sense to me as it seems most folks would enter from the garage after parking their car. Maybe the sign was there and just not where you entered ?