For the past few months, police departments have been using a new iris scanning device to identify people they encounter. Many more police departments will begin using this device soon. The scanner can be held up to the eye of any person and almost instantly identify them more accurately than a fingerprint. Police have imposed restrictions on themselves to prevent misuse of iris scanners. Like a chubby kid guarding a Happy Meal, indulgence is more likely than restraint.
Currently, iris scanners are limited to checking the person scanned against a national database of iris scans. This database presumably only contains criminals, children and individuals who may need assistance, like alzheimers patients. The devices are not supposed to be able to capture and store new entries. These self-imposed limitations may only be temporary.