A U.S. company that supplies meat to some fast-food chains in China has pulled all of its products, some of which were chicken nuggets sold in Hong Kong, made by a Chinese subsidiary. Kin Cheung/AP hide caption

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Foster Farms set up new procedures to deal with salmonella contamination after the USDA threatened to shut down its plants last fall. Justin Sullivan/Getty Images hide caption

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Truffles are among the many foods infused with THC – the chemical in marijuana that gives you a high — already for sale in Colorado. Luke Runyon/KUNC/Harvest Public Media hide caption

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Marijuana-Laced Treats Leave Colorado Jonesing For Food-Safety Rules

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University of California, Davis food safety field scientists Michele Jay-Russell, Paula Kahn-Rivadeneira, Anna Zwieniecka, Navreen Pandher and Peiman Aminabadi celebrate the first day of their experiment testing E. coli survival in soil. Courtesy of Fhon Saharuetai hide caption

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Pepper is the spice most commonly contaminated with salmonella and other pathogens. iStockphoto.com hide caption

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Brent Gentry of Underground Meats rotates a coppa. Underground Meats is behind a new project that aims to lower the barrier to entry for would-be artisanal meat producers by making it easier for them to craft food safety plans. Emily Julka/Courtesy of Underground Meats hide caption

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Food chemists say that pigments from the purple sweet potato are becoming a "natural" alternative to synthetic food dye. avlxyz /Flickr hide caption

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Joe Buley owns Screamin' Ridge Farm in Montpelier, Vt. He says the FDA's new food safety rules threaten the viability of small New England farm operations like his. Here, Buley harvests cucumbers. Emily Corwin hide caption

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Small Farmers In New England Fear New Food Safety Rules

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