He also told the House of Commons that all UK airports must have new "explosion trace detection equipment" by the end of the year.

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It is also important to make sure that operators of Explosive Detection Systems (EDS) and Trace Detection Systems (TDS) learn to identify specific X-ray transmission properties of the materials they are called upon to identify.

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He told CNN that there needed to be greater investment in random searches by agents with explosive trace detection equipment and greater deployment of CCTV cameras, saying the extra investment needed in mass transit security amounted to a fraction of the economic cost of a successful attack.

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