That security liar is actually a cop with a hidden badge and gun, he was likely wearing that security get up to harass folks and then when they do what is their legal right they come out with the badge and act like an asshole! There was also a sketchy female with a k-9 security shirt who walked into the convention center with a vicious looking dog. She was driving a blue slightly teal Ford Bronco with VA plates: XVZ5159 (no other markings on the car other than Ford logos) and she circled the place a few times before she went in.
the car was a bit similar to this '96 Bronco in style:
www.carsurvey.org/images/ford_bronco_1.jpg