Yes Adam,
You are right, my son is autistic and I had a murcury test done on him with his hair and there were no signs of mercury at all. It startled me. Then I found out that the mercury is so bonded in the brain it cannot release mercury, so therefore it does not show any. I've heard the best way to have a mercury test is a urine test or stool. And thats if the mercury is in your body. Not your brain.
Hope it was helpful. Sandy