according to the DPS website..
20.32 Window Tinting. All vehicles that have window coating, tinting, or sunscreening applied to the windows must be inspected for the following:
1. Inspect for and reject if:
a. Glass coating or sunscreening devices on windshields:
1) Extends downward beyond the AS-1 line or more than five (5) inches from the top of windshield on vehicles without an AS-1 line. Measurements shall be taken from inside the windshield; or
2) Is red or amber in color.
b. Glass coating or sunscreening devices on windows:
Windows immediately to the right and left of the driver, which open, have less than 25% light transmittance.
...so he should be fine with 25% up front and 5% on the back..
come and join the Hatch nation and be the first '12 focus in the group