An erroneous report from the German government pointing to the Spanish cucumber as the source of the deadliest E. Coli outbreak in modern history presents an interesting case, in the context of EU law, on the extent a Member State can take action to arrest a public health crisis and the observance of the principle of proportionality.It is recognized that Member States have wide discretion in cases where the health and life of humans are at risk. This broad discretion is reinforced by the availability of the precautionary principle in addressing potential risks. However, while the precautionary principle gives Member States much leeway in matters of public health, Member States must be reminded that the all-encompassing principle of proportionality must be respected.Despite the dramatic impact of Germany’s erroneous report on the functioning of the internal market, the Commission and even private individuals have so far been unwilling to take legal action against Germany, thus missing the opportunity to establish observable standards for Member State action in cases of genuine health risks and to create a method of accountability and reparation for incorrect and/or incomplete disclosure of scientific studies. Nevertheless, the effects of Germany’s erroneous report on the agricultural sector teach us that Member States must work closely together to avoid a situation of panic. A well-reasoned, transparent and objective report, utilizing the resources of all Member States involved and perhaps even the Commission, can thus prevent another ‘killer cucumber’ scare.