Dr. Cutler is not the only authority on the subject, though he would have everyone believe this is so.
Dr. Buttar cured his son of mercury-induced autism with DMPS, which according to Dr. Cutler should not have worked.
Apparently the body has mechanisms that will redistribute mercury from the brain to the body if you keep getting it out of the body. I don't buy for a second that the BBB is such a rigid mechanism that can only be broached with Cutler-approved chemicals.