I would think though that at least at and nearing the viewing stands and finish line area that no back packs would be allowed. They do it in DC all the time.
Here’s a twist ....Pres. BO is soon to speak (CNN) about his disappointment of the gun law not passing....round and round we go! Hummmm....and the briefing on the bomber is???
They have this guy...meanwhile Bo has to control events and or distract as well!