This paper provides a historical and legal perspective of EU regulation on genetically modified organisms (GMOs)—through its initial development to its current position—in view of major advancements of modern molecular biotechnologies used for agriculture. We argue that the emergence and development of EU regulation of GMOs were shaped by antecedent events, notably bovine spongiform encephalopathy (BSE) or ‘mad cow disease’ and the public fears that ensued around food safety. These regulatory emergencies were a key factor prompting national governments and EU institutions to work out the framework for the application of the precautionary principle to agricultural biotechnology. Moreover, while modern biotechnology techniques eliminate many ...