La. Stat. tit. 33 § 4716
Whenever any municipality or parish, the parishes of Bossier and Caddo and the cities of Bossier City and Shreveport excepted, owns real property wholly within the territorial limits of another municipality or parish, and not contiguous to the territorial limits of the owning parish or municipality, the municipality or parish in which the real property is located shall exercise the police power and have jurisdiction of the real property.
The municipality or parish in which the real property is located may go upon the property for the purpose of policing it, make arrests, and confine any person charged with crime in the jail of the parish or municipality. All offenses committed upon the real property shall be subject to the jurisdiction of the courts of the parish or municipality in which the property is located.
La. R.S. § 33:4716