"The facial recognition system has come under fire from privacy groups for mixing traditional mug shot photos with non-criminal faces pulled from employment records and background check databases. The system is expected to collect as many as 52 million faces in total. Some in the industry have also called out the IPS as ineffective, based on its relatively low rate of success. For a given face, NGI returns a list of 50 candidates, and only promises an 85 percent chance that the suspect will be on the list."
