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Retochic - //In other words if you get behind a wheel in full knowledge you've downed a huge amount of alcohol, if coaught you will get the same punishment as if you are cauhgt on the school run with a tiny amount of alcohol in your blood from the two glasses of wine you had with your meal the night before. //
Again, you appear to be pleading the case for the 'moderate' drink driver.
There is no such thing. If you have alcohol in your system, your driving is impaired. Never mind if you acknowledge that or not, or even if you care, and plenty do not.
If you are going to drive a car, don't drink alcohol.
So make the rule, make people aware, and enforce it.
I really fail to see where the problem or argument comes from.