Officials from Dallas Area Rapid Transit trains (DART) have defended criticism over its plans to use facial recognition software in conjunction with a new surveillance system.DART plans to introduce a system that cross checks passenger's face data against that the agency uploads into its own database.DART police chief James Spiller told the Dallas Morning News that the system could be used when a law enforcement agency sends out alerts about missing or wanted people.It could also alert the agency when frequent fare evaders who have been banned from a bus route or train line try to ride the system.The newspaper notes that a stabbing at a downtown Dallas station last year also sparked a petition demanding that DART increase security, including adding cameras on trains.However, critics say the agency's plans will infringe on citizens' privacy.”There are good things, of course. But they come with a steep price paid in our liberty, and it's a price tag that keeps growing higher the more the system is used”, wrote a counter-point editorial in the same newspaper.