The Agricultural Marketing Service of the U.S. Department of Agriculture (USDA) has issued a final rule clarifying that the Organic Foods Production Act of 1990 and its implementing regulations require “periodic residue testing of organically produced agricultural products by accredited certifying agents.” Effective January 1, 2013, the rule also “expands the amount of residue testing of organically produced agricultural products by clarifying that sampling and testing are required on a regular basis [and] requires that certifying agents, on an annual basis, sample and conduct residue testing from a minimum of five percent of the operations that they certify.” See Federal Register, November 9, 2012.