HEATHROW terminals 2 and 4 will be the subject of the UK”s IRIS (Iris Recognition Immigration System) when a new system is introduced shortly. Under Project IRIS, anyone not holding an EU passport who regularly travels through Heathrow will be invited to have their iris patterns photographed and stored in a database upon departure. Those passengers can then use special automated security check-points which scan their eyes, avoiding queues when they return to this country. Germany's Frankfurt Airport has already introduced the system on a trial basis, along with some US airports. The technology is likely to arouse less suspicion from passengers than a new X-ray machine introduced at Heathrow last year which sees through clothes. The Home Office plans to roll out the system at Heathrow”s other terminal and the rest of the UK”s major airports.
http://www.ind.homeoffice.gov.uk