California’s Rice Certification Act (RCA) requires specific planting and handling protocols for rice, including genetically engineered (GE) rice that could pose commercial risks to rice growers. Based on interviews with growers, marketers, activists, and other stakeholders, as well as secondary sources, this paper describes this policy’s emergence and evolution using a global commodity chain approach. Several studies suggest that GE herbicide tolerant rice would yield profits for California growers struggling with rising weed control costs.