Finally, a commercially viable biometric system must be appropriate for everyone. Great strides have been made in the area of affordability with fingerprint recognition machines. Business users can now afford to provide fingerprint scanners on each computer terminal. Similar scanners for home and laptop use are expected soon. Biometric identification systems have been susceptible to inaccuracy and deceit.
False positives are about one in a million.
Fingerprint scanners are also unable to distinguish whether a finger has been removed from the owner s hand. Similarly, retinal scanners can not detect a dislodged eyeball. Other biometric identification systems have flaws as well. Facial recognition systems, which match landmarks on a human face with those stored in its database, can not distinguish between identical twins. Voice print and signature recognition systems can be affected by simple changes, like the flu or an injured finger.