You must test the growing, harvesting, packing, and holding environment for Listeria species or L. monocytogenes using:

(a) The method of analysis described in “Testing Methodology for Listeria species or L. monocytogenes in Environmental Samples,” Version 1, October 2015, U.S. Food and Drug Administration. The Director of the Federal Register approves this incorporation by reference in accordance with 5 U.S.C. 552(a) and 1 CFR part 5. You may obtain a copy from, and/or inspect a copy at, the Division of Produce Safety, Center for Food Safety and Applied Nutrition (CFSAN), U.S. Food and Drug Administration, 5001 Campus Dr., College Park, MD 20740, 240-402-1600; FDA's Main Library, 10903 New Hampshire Ave., Bldg. 2, Third Floor, Silver Spring, MD 20993, 301-796-2039; http://www.fda.gov/fsma; or at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal__register/code__of__federal__regulations/ibr__locations.html; or

(b) A scientifically valid method that is at least equivalent to the method of analysis in §112.152(a) in accuracy, precision, and sensitivity.