Feet and toes are unique as hands and fingers. In 1952 William Gourley was convicted of safe-breaking with the only linking evidence being the print of his big toe.
It should be possible to use a biometric pad on a set of scales to identify the person and analyse and store the weight.
Biometric scales using fingerprints have been patented, but it means the scales must be less compact.
The idea is obvious. I wonder if someone makes one.
