Since the introduction of plant biotechnology on the American farm began in the mid-1990s, farmers have planted millions of acres of biotech corn, cotton, soybeans, fruit and other crops.  While these new varieties have enhanced crop protection, reduced production costs and increased yields, they have raised concern among some consumers, legislators and activists.  What is government’s role in assuring human, animal and environmental safety?  To what degree are biotech-derived crops reviewed and regulated?