La. R.S. 33:138

To facilitate effective and harmonious planning of the region or metropolitan area, all parish and municipal legislative bodies, and all parish, municipal or other local planning agencies shall file with the appropriate regional planning commission, for its information, all parish or municipal plans, zoning ordinances, official maps, building codes, subdivision regulations, or amendments or revisions or any of them, as well as copies of their regular and special reports dealing in whole or in part with planning matters. Parish or municipal legislative bodies, or parish, municipal or other local planning agencies may also submit proposals for such plans, ordinances, maps, codes, regulations, amendments or revisions prior to their adoption, in order to afford an opportunity to the regional planning commission or its staff to study such proposals and to render advice thereon.