Hi-tech eye scanners have been switched off at two out of four English airports where they were operating.
The scanners, which were introduced in 2005, have been mothballed at Manchester and Birmingham airports.
They will continue working at London's Heathrow and Gatwick airports until after the 2012 Olympics.
A UK Border Agency spokeswoman said the government was reviewing the use of the scanners in the light of new technology.
The Iris Recognition Immigration System (IRIS) was first introduced into Heathrow in 2005 and rolled out at Birmingham, Gatwick and Manchester in the following year.
http://www.bbc.co.uk/news/uk-england-17058448
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