The CTA has begun testing technology that uses artificial intelligence to identify guns in its “L” stations. The technology, from company ZeroEyes, automatically detects guns that have been brandished. Images are sent to a ZeroEyes operations center where they are reviewed by staffers who determine what the object is, then alert relevant authorities like police, CTA officials and Chicago’s Office of Emergency Management and Communications. The goal, CTA officials said, is to alert police quickly to any situation arising at the transit agency’s stations.