Amongst all the biometric devices that are out there in the market today. The most secured for me is the Biometric Retina Scanner. The most sensitive part of the body is the eye. You cannot even touch your own eye especially your retina for fear of causing it damage. So nobody can touch it nor steal it right let alone copy it. Disembodiment is also not an option because the device will no longer accept eyes or retinas that do not have blood coursing through the veins or capillaries. So when it comes to security, it is definitely secured.