There's that study they did where they put amalgam fillings in sheep and monkeys. You can see something like an x-ray that shows where all the mercury got concentrated. I don't know if the animals were alive or if they had to be dead in order for those measurements to be taken. But yes it would be so very beneficial to show someone a schematic of their body that clarified where the mercury was. Maybe we'll have to wait until the general public has accepted that many people are mercury-poisoned, and then they'll develop the technology.