With little notice and only occasional complaints, the American military and local authorities have been engaged in an ambitious effort to record biometric identifying information on a remarkable number of people in Afghanistan and Iraq, particularly men of fighting age. Information about more than 1.5 million Afghans has been put in databases operated by American, NATO and local forces. In Iraq, an even larger number of people, and a larger percentage of the population, have been registered. Data have been gathered on roughly 2.2 million Iraqis. A citizen in Afghanistan or Iraq would almost have to spend every minute in a home village and never seek government services to avoid ever crossing paths with a biometric system. What is different from traditional fingerprinting is that the government can scan through millions of digital files in a matter of seconds. While the systems are attractive to American law enforcement agencies, there is serious legal and political opposition to imposing routine collection on American citizens. Various federal, state and local law enforcement agencies have discussed biometric scanning, and many have even spent money on hand-held devices. But the proposed uses are much more limited, with questions being raised about constitutional rights of privacy and protection from warrantless searches.