Los Angeles will utilize AI-powered scanners at Union Station over the next month in an effort to stop passengers with hidden weapons from boarding the rails. Commuters descending to underground platforms for the A, B and D lines (formally known as the Blue, Red and Purple lines) will enter into the testing ground for Metro's 30-day pilot program, which went into effect on Tuesday, though the scanners will not run every day. The program arrives amid growing concern over passenger safety, with Metro recording an uptick in arrests this year for riders carrying concealed weapons. The roughly 6-foot-tall Evolv Technology scanners use artificial intelligence to pinpoint on a person's body where they could possibly be carrying a weapon, according to the company's website. All weapons are banned on the Metro system, and it is illegal to carry a concealed firearm without a permit in California.