To this date, the European Union (European Commission, 2004) has not yet set any tolerance limit for POC residues in fish. What it has developed for its some 25 member states are similar residue limits but on fat basis and for meat other than marine mammals. Its basis for and its process of such tolerance development were influenced greatly by those of the Codex Alimentarius Commission, which is the policy unit created jointly by FAO and WHO in 1963 to set region wide (or supposedly world wide) food standards including maximum limits for pesticide residues in foods. These maximum limits have been coined with the technical terms maximum residue levels or maximum residue limits (e.g., Racke, 2000, 2002), or MRLs for short.