Tensions are emerging between the State and elected officials over the future prison of Magnanville (Yvelines) It is in particular the precise location of the 700-place penitentiary center, expected for 2027-2028, which poses a problem. In its very latest version of the Master Plan for the Ile-de-France region (Sdrif), the region's services have placed a small pellet on a piece of land.

It is this vagueness which could well undermine the project.