Aspects include claims, systems, and methods for testing food commodities, including without limitation bulk food commodity stores to identify the presence of contaminants. Such contaminants tested for may include biological, chemical, or radio nuclear material. Another aspect is marking and/or tracking food commodity stores that have been certified as either being contaminated or safe. Still another aspect is an automated or automatic system for measuring the level of contamination in a given food commodity store, and for marking and tracking food commodity stores tested for contamination.