It doesn’t.
There are many factors that combined reduce the instances of impairment and associated deaths and injuries.
Societal attitudes change
Better infrastructure
Safer vehicles
Other changes in laws, which reminds me, some people lost their ####ing minds when seatbelt laws were enacted.
They also lost their #### when helmet laws were enacted.
Nobody gives a damn about those laws now.
There are a lot of things that combined reduce the level of instances. The reasons above are but a few of them.
In the other countries, the amount of deaths and injuries dropped off a cliff immediately following enactment of laws allowing random testing. This means those laws can be attributed to a step change that reduced death and injury.
And none of those countries have become the totalitarian wastelands full of bizarro world events you have described.
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