Regarding "GMO labeling: Know what you eat" by Arizona Republic editorial writer Linda Valdez (Viewpoints, Feb. 23):
I am the dean of the University of Arizona College of Agriculture and Life Sciences. I tell all our research scientists that we aren't hired to prove our preconceptions or to advocate. We don't set policy. Our job is to do the best science and to provide unbiased data. We also use our scientific expertise to review what others have done.