Facial recognition technology helped identify eight people with previous criminal records, while no theft, mobile phone theft or chain-snatching cases were reported. Hyderabad: The Hyderabad Police detained 116 suspicious persons during the Lal Darwaza Bonalu celebrations held on August 9 and 10, with facial recognition technology helping identify eight people with previous criminal records. The CCS Special Crime Team and local police used facial recognition cameras linked to the criminal database as part of intensified surveillance to prevent pickpocketing, mobile theft and chain-snatching.