As part of a pilot project by the Transportation Security Administration (TSA) to assess the use of facial recognition technology at a number of airports across the country, US switching to facial recognition technology at airports. The technology is both used in checking to make sure the people at the airport match the ID they present and that the identification is in fact real. A TSA officer is still there and signs off on the screening. The technology is currently in 16 airports. Why is the technology controversial ?