Even scarier - the search space for facial recognition is much, much smaller once one person in a group is identified. At a bar, a random group of people is not

Even scarier - the search space for facial recognition is much, much smaller once one person in a group is identified. At a bar, a random group of people is not a random group of people once someone is identified. Instead of searching all of Washington, D.C., just search all their friends and their friends in the DC area.