FTA: As participants were leaving and crossing the business parking lot, officers saw "an SUV ... drive recklessly through the crowd of pedestrians," the release said. "Given the dangerous driving behavior observed, officers conducted a traffic stop on the vehicle and identified the driver as Joseph R. Checklick Jr., 21, of Culpeper [VA]," police said.
Note to all: Assume that the absolute worst about personal privacy invasion -- via phone or facial recognition technology, from every local, state, and federal law enforcement agency, not to mention every private property owner -- has already taken place and is getting worse all the time. Fret and rage all you want about it.
Then cast all your worries and assumptions aside, because all four of those entities are already way ahead of you.