For a brief moment on Thursday, I was actually caught doing this even though I was part of the EE line going in. I will say, this all seems like theater. I had to unzip my backpack, but the checker only looked in the main compartment and ignored like the other 5 or 6 pockets in my backpack. I also had to open my camera bag, but the person only took a glance then told me it was fine. And I also had to empty out my pockets, which took forever because I have so much stuff (wallet, keys, battery charger, schedule, phone, sunscreen, etc.).
The moment, I passed through though, the security supervisor was screaming, "What are you guys doing?!?! Let these folks in, we don't have time for this, we need to get everyone into the exhibit hall!" And thus, they stopped doing this. I could not imagine trying to do this every single time coming in and out of the building.