In New Mexico, the law permits drivers to have a visible light transmission (VLT) of at least 35 % on the front side windows and at least 20 % on the rear side and back windows as of 2026. This means the windshield may be clear, the front side windows must let in roughly one‑third of outside light, and the rear windows can be darker but cannot block more than 80 % of light. Anything darker than these limits can result in a traffic stop, a fine of up to $250, and a requirement to replace the film.
Current Legal Limits
New Mexico Revised Statutes (NMS) § 66‑5‑5 sets the VLT standards for motor vehicles. The statute specifically states:
- Front side windows – minimum 35 % VLT.
- Rear side windows and rear windshield – minimum 20 % VLT.
The law does not differentiate between passenger cars and light trucks; the same limits apply across all passenger‑type vehicles. Medical exemptions exist for drivers with certain conditions, but the exemption must be approved by the Department of Transportation and displayed on a visible placard.
How Tint is Measured
Tint is measured with a photometer that determines the percentage of light that passes through the glass. A VLT of 35 % means 35 % of visible light is transmitted, while 65 % is blocked. Law‑enforcement officers use handheld meters during traffic stops, and the results are recorded in the vehicle’s inspection report. Improperly installed or aftermarket films can create uneven transmission and may be flagged even if the overall VLT meets the legal threshold.
Exceptions and Penalties
Medical exemptions (e.g., for photosensitivity) are granted under NMS § 66‑5‑5(b). Drivers must submit a physician’s statement and receive a stamped placard that must remain in the vehicle at all times. Failure to comply with the tint limits results in a citation, a $250 fine, and the vehicle may be ordered to the nearest authorized tint shop for re‑verification. Persistent violations can lead to increased fines and points on the driver’s record.
Frequently Asked Questions
What happens if my rear windows are darker than 20 % VLT?
The vehicle will be cited for a violation of § 66‑5‑5. You will be required to remove or replace the film to meet the 20 % minimum, and a $250 fine may be imposed.
Are headlights or mirrors affected by tint laws?
No. The statutes only address side and rear windows. Headlights, taillights, and mirrors are regulated separately under equipment safety standards and are not subject to VLT limits.
Can I use a darker tint on a driver’s side window if I have a medical exemption?
Yes, a physician‑approved exemption can allow tint darker than the standard 35 % VLT on the front side windows, provided the exemption placard is displayed as required.
How can I verify my tint’s compliance before a police stop?
Purchase a handheld VLT meter or have a professional tint shop test the film. The meter will give a readout of the percentage transmitted, ensuring you stay within the legal thresholds.
Does the law differ for commercial vehicles or RVs?
The same VLT limits apply to all passenger‑type vehicles, including RVs and small trucks. Larger commercial trucks with separate cab and cargo sections may be subject to different regulations, but the passenger cabin follows the 35 % front and 20 % rear standards.