The concept is like security at amusement parks, where people are screened as they walk past pillar-style scanners.

As part of a one-year pilot program, the weapons detection technology was introduced to riders on Monday at Metro's Norwalk Station on the Green Line and San Pedro Street Station on the Blue Line.

LA Metro continues its push to better protect riders. Police are seeking the public’s help in identifying a group of males after a college student was brutally attacked over the weekend on Tremont Street.