This has been copied straight out of the Texas State Inspection Handbook and allows for a fudge factor up to a 20% (on restricted windows) to cover different scenarios. This shown here is, not the actual law, just the enforcement policy. Don't be confused to think that putting a 20% darkness film on you windows will work for you. The reason being that, with age, your film (all film) will lose a slight un-noticeable amount of it's clarity due to the suns effects. This is normal. This in combination with any factory tint already existing in the glass, will put you over the enforcement line (i.e. 17%-16% or more depending on film quality). You won't notice the slight change over time, but the light meter they use to check it probably will. These kinds of problems usually arise later down the road, when the newness of the conversion from no tint to tinted has faded from your mind, and the whole tint job is usually the last thing on your mind at the moment if/when a legal problem arises....To avoid these kinds of inconvenient problems, be more conservative and choose film darknesses to allow for this. 1987 and older are no longer excluded with the amended law and this will likely affect the inspection enforcement policy and will apply for all year models instead of 1988 and newer.

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