The Food Safety Modernization Act establishes new requirements for tracing foods through the supply chain. It will require recordkeeping for high-risk foods and the ability to trace foods one step forward and one step back. This poses challenges due to the complexity of distribution systems and suppliers. Regulators want faster and more consistent tracing to help narrow the scope of foodborne illness outbreaks. The new law requires the FDA to define high-risk foods and establish tracing requirements within two years, with some exemptions for small farms. It also establishes pilots to demonstrate tracing technologies and costs. Industry should view tracing as a food safety tool and work with regulators to develop effective and cost-efficient tracing systems.