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.

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

Authorities will start screening Metro passengers at one L.A. area station for concealed weapons on Monday as part of the transit system’s safety campaign.  KTLA 5's Ellina Abovian reports. (April 28,