"THROUGH A LITTLE-DISCUSSED potential bureaucratic rule change, the Department of Homeland Security is planning to collect unprecedented levels of biometric information from immigration applicants and their sponsors — including U.S. citizens. While some types of applicants have long been required to submit photographs and fingerprints, a rule currently under consideration would require practically everyone applying for any kind of status, or detained by immigration enforcement agents, to provide iris scans, voiceprints and palmprints, and, in some cases, DNA samples. A tangled web of defense and surveillance contractors, which operate with little public oversight, have already begun to build the infrastructure that would be needed to store these records."