In Louisiana, non-reflective windshield tint is allowed above the AS-1 line provided by the manufacturer or the upper five inches of the windshield.
FRONT SIDE WINDOWS must allow at least 40% of light to pass through.
BACK SIDE WINDOWS must allow at least 25% of light to pass through.
REAR WINDOWS must allow more than 12% of light in.

In Louisiana, non-reflective windshield tint is allowed above the AS-1 line provided by the manufacturer or the upper five inches of the windshield.
FRONT SIDE WINDOWS must allow at least 40% of light to pass through.
BACK SIDE WINDOWS can be any darkness
REAR WINDOWS can be any darkness

If you break Louisiana's tint laws, you might face fines of up to $150 for your first violation, $250 for your second offense, and $350 for your third or subsequent offense.
Windows behind the driver on some vehicles, such as lorries, buses, trailers, mobile homes, and multipurpose passenger vehicles, are exempt from the light transmittance standard. Furthermore, this clause does not apply to any windows on cars utilized by law enforcement that have been tinted in compliance with it.
In Louisiana, all window tints must have a luminous reflectance of no more than 20%.

LOUISIANA LAW RS 32:361.2

This section of the law outlines the conditions for obtaining a medical exemption for a motor vehicle registered in the state, allowing the vehicle to be equipped with sun screening material (window tint) that would otherwise be in violation of state law. In order to qualify for the exemption, the registered owner, spouse, or other family member operating or authorized to operate the vehicle must have an affidavit signed by a licensed optometrist or physician stating that the person has a physical or medical condition involving the effects of the sun that makes it necessary to equip the vehicle with such material. A copy of the affidavit must be kept in the vehicle at all times. The exemption may be subject to review every three years, unless otherwise deemed necessary by the department. Persons convicted of violent crimes or drug offenses are not eligible for the exemption.