“The law doesn’t prohibit driving under the influence of (prohibited) intoxicating drugs”:

1. A Correct, since the law doesn’t prohibit the use of intoxicating drugs.
2. B Incorrect. The law explicitly mentions that it is prohibited to drive under the influence of a certain quantity of intoxicating drugs in the driver’s blood.
3. C Incorrect. It is explicitly prohibited by the law to drive under the influence of intoxicating drugs.
4. D Correct. The law only prohibits driving under the influence of alcohol.