The short answer
Arizona's passenger-vehicle tint statute does not state the same 33-percent light-transmission figure for side windows behind the driver or for the rear window. It permits material on those windows with luminous reflectance of 35 percent, plus or minus 3 percentage points, or less. The rear-window exception also depends on the vehicle having outside mirrors on both the left and right that provide the driver the required rearward highway view.
That does not make every extremely dark rear installation appropriate. Material may not be placed in a way that obstructs or reduces the driver's clear view except as the statute permits, and the replacement glass must retain the correct federal glazing classification and vehicle functions. Consider nighttime visibility, backup maneuvers, interior cargo, camera use, defroster lines, antennas and the driver's ability to use both mirrors. Factory privacy glass and aftermarket film are different products, so an installer should identify what is already present before recommending additional film. Rules also differ outside Arizona; a vehicle driven across state lines must meet the law that applies where it is operated.
