Article L2215-1 of the French General Code of Local Authorities
Municipal policing is carried out by the mayor, however: 1° The representative of the State in the département may take, for all or several of the communes in the département, and in all cases where this has not been provided for by the municipal authorities, any measures relating to the maintenance of public health, safety and tranquillity. This right may only be exercised by the State representative in the department…