I read that there are specialists that do it- probably would need to verify that they are legit and proper care is taken.
I think you can get blood tested for it to see if they are leaching the mercury or not. If they are stable and "sealed" {not leaching} might be best to not stir things up.
It's been a couple years since I read up about this so I could be wrong.
Ok I had to do my Google thing
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http://www.google.com/search?q=mercu...ient=firefox-a