BlueFish, you are in a heap of trouble, boy!!!! LOL. Hope you are old enough to reconize where that came from.
Alabama Law on the subject:
Section 32-5-215
Windshields must be unobstructed; windshield wipers; tinting.
(a) No person shall drive any motor vehicle with any sign, poster or other nontransparent material upon the front windshield, sidewings or side or rear windows of such vehicle which obstructs the driver's clear view of the highway or any intersecting highway.
I think the key words in that part of the statute are "nontransparent material" as it could possibly apply to the job you are currently doing.
[....]
(d) No person shall operate a motor vehicle which has a windshield, sidewing or rear window which has tinting to the extent or manufactured in such a way that occupants of the vehicle cannot be easily identified or recognized through the sidewing or rear windows from outside the motor vehicle.
(e) The provisions of this section shall not apply to the manufactured tinting of windshields of motor vehicles or to certificates of identification, decals or other papers required by law to be displayed on such windshield or windows.
All you can do is advise your client/customer of the above as they are the ones who will face the consequences should a smoky nail him.
Just for grins, I checked PA state law as Gino always has a unique perspective on laws both real and imagined.
The PA folks don't seem to be able to make up their mind at all.
The statute seems like a simple read.
TITLE 75 Section 4524 (e)(1) of the Pennsylvania Common Statutes states that
(1) No person shall drive any motor vehicle with any sun screening device or other material which does not permit a person to see or view the inside of the vehicle through the windshield, side wing or side window of the vehicle.
Rear windows aren't even mentioned (good). But kiss a full wrap goodbye (from a plain read). Then you stumble across a page like:
http://www.berksweb.com/users/dmv/tint/
Nothing in law is ever simple.