18 U.S.C. § 343 : US Code - Section 343: Presumptions

Search 18 U.S.C. § 343 : US Code - Section 343: Presumptions

For purposes of this chapter -
(1) an individual with a blood alcohol content of .10 percent
or more shall be presumed to be under the influence of alcohol;
and
(2) an individual shall be presumed to be under the influence
of drugs if the quantity of the drug in the system of the
individual would be sufficient to impair the perception, mental
processes, or motor functions of the average individual.