Will your metal detector pick up iron in your blood?. The reason I ask is my C Scope CS3MX seems to pick up a small signal in a couple of people I tried this on. The shoulder blade is where the signal is. That is not far from the heart so I wonder if iron in the blood should be a consideration?. Disclaimer: Please do not try this on anyone with a pacemaker or pregnant as I am not sure that it is safe. I would be interested in your results / comments, Cheers.