La. Public Officers and Employees § 42:71
Any person who assumes or pretends to be a public officer without the authority of an election, or without the authority of a commission from the governor when a commission is required; or who has been duly addressed out of an office that he held, in the manner provided by Article IX, Section 3, of the Constitution of Louisiana, or who has been removed from such an office by impeachment or recall, is a usurper.
Any usurper who attempts to exercise the functions of a public officer or office, and who interferes with any public officer in the discharge of his duties; or refuses to vacate an office, after having been removed therefrom in the manner provided by Article IX, Section 3, of the Constitution of Louisiana, or by impeachment or recall, shall be fined not more than five hundred dollars or imprisoned not more than six months, or both.
Each day's action by a usurper shall constitute a separate offense.
La. Public Officers and Employees § 42:71