Precautionary: A Customary Principle in The EU?

The precautionary principle has been widely discussed in the academic, legal and policy areas. Debates stem from various Formulations of the principle and its emerging in binding and nonbinding international instruments in varied fields.
The role of the European Union and its members is undisputed in evolution of the principle. It can be recognized in different contexts; from its statements in international disputes to Jurisprudence of its judicial organs.
This paper examines the situation of the precautionary principle in Domestic legal systems of European countries, primary and secondary rules of the EU and the jurisprudence of general courts, ECJ and ECHR to make a decision on the customary status of the principle in this region.