It wasn't official... it was just a crude little hand-written thing behind the detection unit on the wall. It was in the TSA-only area or I would have.

I'm not totally sure how the procedure was working in the terminal. I think if you were domestic and had a BP for the other airside they would let you through, but not positive. I was staring at the TSO by the train and not the screening area. Hopefully someone else will come through soon and see. This was for airside 2/gates 60-99.