The problem is neither incapacitated drivers, drunk drivers, drivers without seat belts, cars with bad breaks, car without headlights or any other contributing

The problem is neither incapacitated drivers, drunk drivers, drivers without seat belts, cars with bad breaks, car without headlights or any other contributing sources to car crashes. The problem is the car crash. Everything else is just contributing risk that a car crash might occur or that people will get serious injured if there is a car crash. In-vehicle continuous testing will not remove all risks to car crashes, and with drugs as an example, amphetamine makes people both awake and responsive but it also carries a risk of delusions and paranoia which is linked to high risks. AI/ML/software is know for its high false positive rates, so if it was enforced it would lead to many drivers unable to use the car because of a false positive hit. If it was enforced, then the high risk reduction wouldn't occur before the crash and society in general will want to impose laws to fix that. Car crashes effects more than just the driver, and it not reasonable that so many people die from car crashes each year.