That's because they typically require studies that meet a long list of criteria, says Wolfgang Dekant, a toxicologist at the University of Wuerzburg in Germany and a member of a panel that reviewed BPA research a few years ago for the European Food Safety Authority.

NPR: Waiting On Science To Say If Plastic Chemical Is Safe

Note: Further information on the constitutional background of Lithuania is provided by the International Constitutional Law Project at the University of Wuerzburg.

UNESCO: Lithuania - Constitution

Note: Further information on the constitutional background of Ireland is provided by the International Constitutional Law Project at the University of Wuerzburg.

UNESCO: Ireland - Constitution