I don't believe that the recent research demonstrating the leaching of BPA involved the kind of food-grade polycarbonate (Lexan) containers that we're talking about. The original scare started when a scientist noticed a higher rate of genetic abnormalities in her mice. She traced the cause back to BPA leaching from the polycarbonate mouse cages that had been cleaned with a strong detergent. These cages are a lower grade of polycarbonate and I'm assuming that the detergent was much stronger that any household detergent.