1. Introduction. – 2. The Emergence of Independent Administrative Authorities in France. – 3. The Non-Dependency of Administrative Authorities to the Executive Authority – 4. Justifications for Granting the Independent Administrative Authorities the Punitive Power. – 4.1. Maintaining the State's Financial and Economic Interests (The Unique Nature of Independent Administrative Authorities). – 4.2. The Inefficiency of Criminal Penalties Imposed by Criminal Judiciary in the Economic and Financial Sectors. – 4.3. The Efficiency of Sanctions Imposed by Independent Administrative Authorities. – 5. The Constitutionality of Granting Punitive Powers to the Independent Administrative Authorities. – 6. The Accumulation of Criminal Penalties and Administrative Sanctions of Punitive Nature. – 6.1. The 'Ne bis in idem' Principle. – 6.1.1. The Legislative Basis for the 'Ne bis in idem' Principle. – 6.1.2. The Judicial Basis for the 'Ne bis in idem' Principle. – 6.2. The Accumulation of Criminal Penalties and Administrative Sanctions of Punitive Nature. – 6.3. Position of Constitutional Judiciary regarding the Accumulation of Criminal Penalties and Administrative Sanctions of Punitive Nature. – 6.3.1. The Principle of Non-Accumulation of Criminal Penalties and Administrative Sanctions. – 6.3.2. Contradiction of the Preferential Approach towards the Accumulation of Criminal and Administrative Sanctions between the Taxation and Financial Law. – 6.3.3. Grossness of Actions is a Standard of Inconsistency and Contradiction concerning the Duality of Sanctions. – 6.4. The Position of the French Court of Cassation and European Judiciary regarding the Accumulation of Criminal Penalties and Administrative Sanctions of Punitive Nature. – 6.5. Position of the European Court of Human Rights and the European Court of Justice. – 7. Conclusions.