Iris recognition for prisoners to deter drug abusesBiometric treatment records are being introduced in UK jails to ensure drugs go to the right patients / The Guardian, Tuesday September 30 2008
http://www.guardian.co.uk/society/2008/sep/30/prisonsandprobation.drugsandalcohol
"Prisoners are having the iris patterns in their eyes or their fingerprints recorded as part of a security initiative aimed at tackling drug dealing and preventing overdoses in jail."