Since you have broached the subject, I will tell of my experiences.

My home airport, as well as some to which I travel, have also installed the ATR system. I always wear pleated pants. All green. I have tried a wadded up tissue, green. I left a bit of change in my pocket, green. I wore earplugs on a lanyard around my neck and under my shirt, green.

I have decided to try various tests each time I go through. I agree with you that the false alarms seem to be over hyped. I think they were occurring with operators. The computers do no react to them.

The only yellow I have gotten was when my belongings were behind me on the belt and I moved my head to keep an eye on them. My whole face was alarmed, but the operator waved me through because he saw me move.