Also, use common sense. Even healthy animals and fish, exposed to mercury in the environment, all accumulate mercury. These animals are eating there natural diets living in very healthy environments in some places and they still build up mercury (and they certainly don't have amalgam fillings!!!). The longer an animal lives and the more mercury it is exposed to, the more it will contain in its body. I'm pretty sure these animals detox systems are still functioning properly, its just that mercury loves to accumlate in living tissues.

This is why you need something like ALA to get mercury out of stored tissue, especially the brain, otherwise you will be just like all the other animals and accumulate more mercury deep in your tissues.