Loco_Nomad, that's a great question...
The way that law is written, it says that the combined measurement of the VLT (visible light transmitted) of your glass and tint must be 70% or higher on the front doors of your vehicle. Most glass is rated around 88%. So adding the 70%, technically, would give a combined rating of lower than 70% and therefore be "less than legal". But, the odds of it getting noticed at all, namely ticketed, are extremely low. They would need a meter to tell you the exact measurement and I would be confident that the reading of said meter would be in the low 60%. If you want 100% legal, you'd have to get a film in the high 80s% and THEN get is measured with your glass to confirm.