The French system of constitutional review is very specific and was used for years as an example of the only system in which the compatibility exam between laws and the Constitution was performed by the Constitutional Council - which is a politic institution - preventively. In other words, this exam happened before the legal provisions come into force and take effect. As a result of the lack of protection of the constitutional rights and freedoms, the French Constitution was gradually losing its supremacy. That is why jurists during the 80 s started to discuss a proposal of change and reform. When in 2008, a constitutional amendment was approved, creating a mechanism which gave individuals the right to contest the constitutionality of whichever legal provision they deemed to be violating their constitutional rights and freedoms. This research examined the factors that preceded and influenced the reform, and above all the effects and consequences generated by the Priority Question of Constitutionality in French Law.