La. R.S. 9:2800.17

Whenever a motor vehicle is damaged through the negligence of a third-party without being destroyed, and if the owner can prove by a preponderance of the evidence that, if the vehicle were repaired to its preloss condition, its fair market value would be less than its value before it was damaged, the owner of the damaged vehicle shall be entitled to recover as additional damages an amount equal to the diminution in the value of the vehicle. Notwithstanding, the total damages recovered by the owner shall not exceed the fair market value of the vehicle prior to when it was damaged, and the amount paid for the diminution of value shall be considered in determining whether a vehicle is a total loss pursuant to R.S. 32:702.