http://home.pcisys.net/~bpc/auto_law/tint/tint_ca.html check it out.
The one you refered to is for sometime around 1987
http://home.pcisys.net/~bpc/auto_law/tint/
I found the following for state tint laws:
http://www.iwfa.com/iwfa/Law_Chart/State%20Law%20Chart.htm
The CA one is for the law passed in 1999. I have no idea if this is the latest one though.
:::::Update:::::
In 2000 the part of the above law was repealed: Front windows must transmit more than 70% of light.
It is now NO tint in front windows. Whatever you want in back windows and rear window.
Here is some more info regarding this (the second question), the first is for those who wondered how those with lifted trucks are legal, and thrid is about exiting and entering car pool lanes. All answered by Highway Patrol.
http://www.motorway.com/Stories/0,1413,243%257E32656%257E2823657,00.html
:::::Yet another update:::::
This is from the CHP's website under FAQ's:
Can I put after-market tinting on the windows of my vehicle?
The main requirements for legal window tinting in California are:
The windshield and front driver's side and passenger's side windows cannot receive any aftermarket tinting.
If the rear window of a vehicle is tinted, the vehicle must have outside rearview mirrors on both sides.
The law prohibits any person from driving any motor vehicle with any object or material placed, displayed, installed, affixed, or applied upon the windshield or side or rear windows, with certain limited exceptions.
However, legislation signed into law effective January 1, 1999, exempts from the above prohibition specified clear, colorless, and transparent material that is installed, affixed, or applied to the front driver and passenger side windows for the specific purpose of reducing ultraviolet rays. If, as, or when this material becomes torn, bubbled or otherwise worn, it must be removed or replaced.