by Jeff Fisher This story begins in 1998 when I reviewed a technical document for the chemical perchlorate, now known to be widely distributed in the environment on earth and has been found in high concentrations on Mars.  In 1998, the subject of this document was a proposed safe drinking water level for perchlorate based on historic medical use of perchlorate as a probe of thyroid function,  in the diagnostic called the thyroid discharge test.  This document changed …