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- <text id=89TT0071>
- <title>
- Jan. 09, 1989: A Deceptive Killer
- </title>
- <history>
- TIME--The Weekly Newsmagazine--1989
- Jan. 09, 1989 Mississippi Burning
- </history>
- <article>
- <source>Time Magazine</source>
- <hdr>
- NATION, Page 27
- A Deceptive Killer
- </hdr><body>
- <p> Few things so deadly have ever looked so innocent. They
- have the appearance and consistency of soft taffy and can be
- molded, stretched or cut into any shape. They burn so safely
- that American G.I.s in Viet Nam used them as emergency cooking
- fuel. Yet plastic explosives pack roughly twice the force of an
- equivalent amount of dynamite. Many nations, including the U.S.,
- produce them for military purposes. But large amounts have made
- their way into the hands of terrorist groups around the world,
- posing a fiendishly difficult problem for airline security.
- Because the explosives can be so easily formed into innocuous
- shapes, they can pass undetected through security checks. The
- deadly plastic is also odorless and cannot be sniffed out by
- trained dogs.
- </p>
- <p> The Federal Aviation Administration has been working with
- two U.S. companies to solve the problem. Starting next summer,
- the FAA will receive five new devices developed by San
- Diego-based Science Applications International Corp. for
- screening checked luggage. The machine bombards luggage with
- neutrons that interact with the nitrogen in explosives, touching
- off a characteristic pattern of gamma rays. In tests conducted
- last summer at Los Angeles and San Francisco airports, the
- devices spotted more than 95% of suitcases containing test
- samples of explosive materials. But because they employ
- dangerous radiation, the machines, which cost as much as $1
- million each, cannot be used on passengers.
- </p>
- <p> That is not a problem with the system designed by
- Thermedics in Woburn, Mass. It uses jets of warm air to collect
- vapors given off by either luggage or the clothing of
- passengers, who would be required to step into a three-sided
- booth. The vapors are then subjected to six different
- computerized chemical tests that together take about 25 seconds.
- In a five-day trial run at Boston's Logan Airport last October,
- the system, which would cost roughly $250,000, nabbed 50 out of
- 50 test samples sent through.
- </p>
- <p> Another technological approach would not prevent bombings,
- but it could help identify those who commit them. Explosives can
- be chemically "tagged" so that telltale traces can be used to
- determine their origin after a blast. If producer nations could
- agree on a tagging system for military explosives, it would
- increase the chance that future terrorists might be tracked down
- and brought to justice.
- </p>
-
- </body></article>
- </text>
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