This book offers an article by article legal commentary on the WTO Agreement on Sanitary and Phytosanitary Measures (the SPS Agreement), which allows WTO members to implement barriers to trade on food or pharmaceutical products in order to protect public health, provided that the measure is based on established international guidelines or backed by scientific evidence. This book looks at the case law which has grown up around the SPS Agreement, includes an analysis of the recent Biotech (GMOs) panel report, examines the working of the SPS Committee, an important site for transnational governance in food safety, and the relationship between the SPS Agreement and international standards.