[MargaretR]

Originally Posted by merseybob

I reckon the answer in the long run is Electrical window tinting which is controlled by the ignition.
Ignition Off you are allowed full blackout/limo tint very secure!
Ignition on controlled by a small box to not allow tinting of any type to the windows forward of the centre pillar and adjustable for the others.
When engaging reverse all tint is off.
These functions can be created/used easily as the gearbox and ignition are already used in reverse parking sensors.

Wow that sounds high tec stuff = another gadget to go wrong (expensively)