^ I know the tint laws, I've worked with a Police Department before. As long you don't tint the front it's fine. The rear doesn't matter, but the front windows can't be tinted. Factory tints are okay for some reason. You probably got pulled over because your front windows were tinted.
Go here to check out the tint laws in California.
http://www.dmv.ca.gov/pubs/vctop/d12/vc26708.htm
http://www.tintcenter.com/laws/CA/
I'm only gonna tint my front windows 90%.without any reflective metallic elements.