La. Stat. tit. 53 § 3
When a state of war exists between the United States and a foreign country, or, in the judgment of the governor, public safety or necessity requires, the governor may, by proclamation, direct every subject or citizen of foreign countries designated in the proclamation, who are in this state, or who may from time to time come into the state, to appear within twenty-four hours after the date specified in the proclamation or after arrival within the state, before the public authorities designated in the proclamation, and personally register his or her name, residence, business, length of stay and other information which the governor may require. The proclamation shall be published in the newspapers designated by the governor. Every person to whom the proclamation is applicable shall also comply with any rules of personal identification which the governor shall from time to time prescribe. The occupant of every private residence, and the owner, lessee or proprietor, operating or managing every hotel, inn, boarding or rooming house, shall, within twenty-four hours after the date specified in the proclamation, notify the public authorities of the presence therein of every subject or citizen of a foreign country to whom the proclamation is applicable, and shall each day thereafter notify the public authorities of the arrival thereat or departure therefrom of every subject or citizen of a foreign country.
Whoever violates this Section shall be fined not more than one thousand dollars or imprisoned for not more than one year or both
La. R.S. § 53:3