![201906us_surveillance_tech_facialrecognition](/sites/default/files/multimedia_images_2019/201906us_surveillance_tech_facialrecognition.jpg)
A live demonstration uses artificial intelligence and facial recognition in dense crowd spatial-temporal technology at the Horizon Robotics exhibit at the Las Vegas Convention Center during CES 2019 in Las Vegas on January 10, 2019.
© 2019 David McNew/AFP/Getty Images