>The people who get incorrect results and who then go and...

From a $100 test? I hope not. In my father's case, he wears sun block now. What he didn't do was run out and have every mole on his body removed because he's at greater risk of Melenoma.

>Just the stress of "shadows" is considerable.

I lived with that stress for a few months. I'll admit it was in the back of my mind, but I was fine.

Afterwards I was telling a friend about the ordeal and he actually said "Man, is there anything worse than being told you have something terrible wrong with you, living with that, then finding out it was a false alarm". Uhm, yeah. How about finding out it wasn't?