Withdrawal interval information can be found on the Food Animal Residue Avoidance Databank (FARAD). FARAD is a National Food Safety Project of the U.S. Department of Agriculture National Institute of Food and Agriculture (NIFA). To obtain scientific information to determine withdrawal intervals, visit the FARAD website at www.farad.org or call (888) USFARAD. Other sources that may be used to determine a scientifically-based withdrawal interval may include scientific literature or other academic sources.
