I've not read the other posts in this thread so I might be going over old topics here, but never the less here goes. I'm firmly in the belief that ID cards would be a good thing, not just ID cards but biometric ID cards. My belief works on several levels. First of all, simply as a security plan. However, the only way to make them work is to make them mandatory. Use taxes to subsidise the cost, and pass a law stating that not being in possession of an ID card is an arrestable offence. Not punishable by prison time, but an offence that means a police officer can take you to a police station and detain you until your identity can be verified. At this point, you could use them to verify identities at any number of points. For example, using the recent London explosions as a basis, if your tube ticket were tied to your ID card, you'd need to have both to board the train. If you don't have an ID card, you can't use the tube. Second, and this is where the biometric data comes in, as a means of warning emergency services of any allergies you may suffer from. For example, if you're in a car accident - late at night, no one else in your car to tell the services you suffer from an allergy to penicillin, let's say - then the emergency services would be able to scan your ID card and immediately know your name, address, next of kin and any allergies or diseases that you may suffer from. This can then direct them to any medication they can or can't use or indeed any that is needed for any one of the multitude of diseases that humanity suffers from. Of course, I'll be labelled somehow by those opposing ID cards as an "infringement of their privacy". Well, I can see little reason not to use ID cards apart from evading criminal activity. I see far more benefits to a biometric ID card system than I see disadvantages.