Rick Vetter was rushing to board the Amtrak train in Charlotte, N.C., on a recent Sunday afternoon when a canine officer suddenly blocked the way.

Three federal air marshals in bulletproof vests and two officers trained to spot suspicious behavior watched closely as Seiko, a German shepherd, nosed Vetter’s trousers for chemical traces of a bomb. Radiation detectors carried by the marshals scanned the 57-year-old lawyer for concealed nuclear materials.

When Seiko indicated a scent, his handler, Julian Swaringen, asked Vetter whether he had pets at home in Garner, N.C. Two mutts, Vetter replied. “You can go ahead,” Swaringen said.

The Transportation Security Administration isn’t just in airports anymore. TSA teams are increasingly conducting searches and screenings at train stations, subways, ferry terminals and other mass transit locations around the country. ………

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