Blaine, Wash., is one of the busiest ports of entry in the Northwest. Thousands of cars are screened every day. Each truck goes through a radiation detection device. If alarm bells go off, they get additional scrutiny. Perhaps the most important tool, however, is the old-fashioned interview. In 1999, an alert US border agent in nearby Port Angeles, Wash., noticed a nervous driver, which led to the arrest of the so-called Millennium Bomber - the only terrorist in recent times believed caught while entering the United States by land.
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