that the amount of "leaching" of "bisphenol A" is not immediately harmful; if the people who make the polymer do it right. It has to be completely consumed in the polymerization reaction, there has to be little or none of the material "half reacted", because polycarbonates can and do go decomposition under certain environmental conditions. In other words, if a very good cross polymerization has been accomplished in the manufacturing production, there will be no "free" bisphenol A hanging around, it will all be part of the polymer structure.
So it depends what they are testing. If i can smell or taste bisphenol A residues present in a badly reacted batch of plastic water bottles, i WON"T drink out of them. Bisphenol A is a hormone mimic, and by itself is a cancer causing suspect.