Whether it's cause for celebration or regret, last month marked the 40th anniversary of the first U.S. airport-wide system to screen all departing passengers in an effort to prevent hijacking. On July 17,1970, New Orleans International in Louisiana became the first airport to use magnetometers to detect weapons-or anything made of metal-together with behavioral profiling of passengers. For anyone flagged by the system, airline personnel formed the initial gauntlet, and U.S. Marshals Service staffers were called in to investigate unresolved questions.
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