To qualify for the California medical exemption for window tint, you need a signed letter from a licensed physician or surgeon certifying that you (or a regular front-seat passenger) have a medical condition requiring protection from direct sunlight. That letter must stay in the vehicle whenever the tinted car is driven. The authority for this comes from Vehicle Code Section 26708(b)(10), and it’s the only route to legally install darker-than-standard film on the front side windows.1California Legislative Information. California Vehicle Code 26708
What the Exemption Actually Allows
The exemption applies to the side windows next to the front seats. Rear side windows and the rear window can already be tinted to any darkness in California without documentation, so the medical letter matters specifically for the glass alongside the driver and front passenger, where standard law otherwise requires at least 70 percent combined light transmission.
Darker-than-standard does not mean unlimited. The sun screening devices installed under this exemption must still meet the specifications in Vehicle Code Section 26708.2, which governs what qualifies as an approved device. People sometimes assume a doctor’s note unlocks limo-black film on the front windows. It does not. It permits tint darker than the ordinary 70 percent threshold, within the device rules the statute sets.
Getting the Physician’s Letter
The process starts with your doctor, not the DMV. Schedule an appointment with a licensed physician or surgeon and explain that you need documentation supporting darker window tint for a medical condition. The letter should state your diagnosis and confirm that your condition requires you to be shielded from direct sunlight. Keep the original in the vehicle whenever you drive it.
California doesn’t publish a rigid template, but a strong letter typically includes:
- Your full legal name
- The specific diagnosis
- A clear statement that the condition requires protection from direct sunlight
- The physician’s signature, printed name, and medical license number
- The date the letter was issued
Specificity helps. A vague note reading “patient needs tinted windows” is technically a letter, but it invites questions from officers and judges. A letter naming the condition and explaining why sun exposure is medically harmful leaves little room for dispute.
Some drivers also file form REG 256A with the California DMV to create a formal record of their exemption. That filing is optional; what the statute actually requires for roadside compliance is the physician’s letter carried in the vehicle.
Conditions That Typically Qualify
The statute does not list specific diagnoses. It covers any condition where a physician certifies the person needs to be shielded from direct sunlight. In practice, the conditions most often supporting a certification include:
- Lupus, systemic or discoid, where UV exposure can trigger flares involving skin lesions, joint pain, and organ inflammation
- Xeroderma pigmentosum, a rare genetic disorder that makes skin extremely vulnerable to UV damage
- Porphyria, a group of disorders where sunlight triggers painful skin reactions
- Severe photosensitivity, whether standalone or as a side effect of medications such as certain antibiotics, chemotherapy drugs, or immunosuppressants
- A history of melanoma or high skin cancer risk where a physician certifies ongoing UV protection is needed
- Certain eye conditions involving severe light sensitivity, including keratitis, albinism, and post-surgical complications
The specific diagnosis matters less than the documented clinical need. If your doctor believes sun exposure poses a genuine medical risk and is willing to put that in writing, the exemption is available to you.
Keeping the Letter Current
The statute sets no expiration date for the physician’s letter. A letter dated several years back is still technically valid, but it can raise questions during a traffic stop. Refreshing it at an annual checkup costs nothing and keeps the documentation clearly current. For chronic conditions unlikely to resolve, a recent date simply removes ambiguity.
If UV Protection Is the Real Concern
Before pursuing the medical exemption, consider whether clear UV film would meet your need. Under CVC 26708(d), California allows clear, colorless, transparent film on any window, including the windshield and front side windows, without any medical documentation, provided the film:2California Legislative Information. Vehicle Code 26708
- Allows at least 88 percent of visible light through on its own, and combined with the glass, at least 70 percent
- Is designed and manufactured to block the sun’s ultraviolet A rays
- Comes with a certificate kept in the vehicle, signed by the installer (or the manufacturer, if self-installed), listing the installer’s or manufacturer’s full name and street address
- Is removed or replaced if it tears, bubbles, or wears down enough to obstruct vision
Modern ceramic and UV-rejection films can block more than 99 percent of UV radiation while staying nearly invisible. For lupus, photosensitivity, and other conditions where UV exposure is the core problem, this route skips the medical paperwork entirely. The film won’t meaningfully darken the window, so it does little for glare or visible light sensitivity. If reducing brightness is what your doctor is trying to accomplish for you, the medical exemption is still the right path.
If You’re Stopped Without Documentation
Driving with darker-than-legal tint and no valid exemption paperwork typically results in a correctable violation, often called a fix-it ticket. The officer cites you, you have a set period to remove or adjust the film to legal levels, and once the correction is verified (usually by an officer signing the back of the citation), you pay a $25 administrative fee to the court to dismiss it.3California Courts. Fix-It Ticket
Ignoring the ticket or missing the correction deadline is where costs climb. The court can convert the correctable violation into a standard infraction, and once penalty assessments and surcharges are added, the total usually runs well over $100. Repeated stops bring repeated citations.
The straightforward preventive step: get the physician’s letter before the tint is installed. Trying to assemble documentation after a citation is stressful and may not resolve the ticket if the film doesn’t meet the specifications in Section 26708.2.
Handling a Traffic Stop
Keep the original physician’s letter somewhere consistent and easy to reach, such as clipped with your registration and insurance. If you also have clear UV film under subdivision (d), keep the installer’s certificate in the same place. A plastic sleeve or lamination keeps the paper from wearing out.
If you’re cited even though you had valid documentation, you can present the letter to the court to contest the ticket. This is where a specific, well-drafted letter earns its keep. A letter that names the condition and states the medical necessity is far more persuasive to a judge than a generic note.