This is more than a little goofy, another boondoggle if you ask me. Most shoes have metal arch supports. Various style soles have different densities of material in varying layers. Many even have hollow regions. They're going to drive themselves berserk with this. It's going to be as bad as the nitrate detections systems that deliver 99.99% false positives on 30% of scans and no knowing how many false negatives the other 70% of the time.

Forecast calls for crazy with scattered psychotic episodes.