The law is the same in Louisiana too...
"The teacher, principal, school security guard, or administrator may search the person of a student or his personal effects when, based on the attendant circumstances at the time of the search,
there are reasonable grounds to suspect that the search will reveal evidence that the student has violated the law, a school rule, or a school board policy. Such a search shall be conducted in a manner that is reasonably related to the purpose of the search and not excessively intrusive in light of the age or sex of the student and the nature of the suspected offense."
"The parish and city school systems of the state are the exclusive owners of all public school buildings and all desks and lockers within the building assigned to any student and any other area of any public school building or grounds set aside specifically for the personal use of the students. Any teacher, principal, school security guard, or administrator in any parish or city school system of the state may search any building, desk, locker, area, or grounds for evidence that the law, a school rule, or parish or city school board policy has been violated."
Once again, you are wrong