scanners-
http://news.bbc.co.uk/2/hi/uk_news/8439285.stmAirport body scanners 'unlikely' to foil al-Qaeda - MP
A computer screen showing the results of a full body scan
Electromagnetic waves are beamed onto passengers to create a 3-D image
Airport body scanners would be "unlikely" to detect many of the explosive devices used by terrorist groups, a Tory MP has warned.
Ben Wallace, who used to work at defence firm QinetiQ, one of the companies making the technology, warned it was not a "big silver bullet".
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Mr Wallace said the scanners would probably not have detected the failed Detroit plane plot of Christmas Day.
He said the same of the 2006 airliner liquid bomb plot and of explosives used in the 2005 bombings of three Tube trains and a bus in London.
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Mr Wallace - an ex Army officer - was employed by QinetiQ as their overseas director in the security and intelligence division before being elected to the Lancaster and Wyre seat in 2005.
There is a big but... in all the testing that we undertook, it was unlikely that it would have picked up the current explosive devices being used by al-Qaeda
Q&A: Security checks at UK airports
Ben Wallace MP
He said the "passive millimetre wave scanners" - which QinetiQ helped develop - probably would not have detected key plots affecting passengers in the UK in recent years.