Eric Metcalfe: It is very interesting that you raise the European experience because it is true that a number of European countries have identity cards, but you have to bear in mind that they are governed by a very different legal tradition—Roman law, not the common law. It is a striking fact that no English-speaking country has identity cards, even after 9/11 and the terrorist attacks. One thing that was unthinkable in the US context was the introduction of identity cards.