world's largest database of biometric data

The FBI is building what is being called the world's largest database of biometric data that will include face, fingerprint, iris and palm scans in order to identify and catch criminals/terrorists. But what's really interesting about this story from the Washington Post's Ellen Nakashima is that the FBI plans to offer a service to employers that will involve retaining the fingerprints of any employees on whom an employer has conducted a criminal background check.