Title 18, Crimes and Criminal ProcedureRelease 119-102
§343 Presumptions
Title 18 › PART I — CRIMES › CHAPTER 17A — COMMON CARRIER OPERATION UNDER THE INFLUENCE OF ALCOHOL OR DRUGS › § 343
Summary
Blood-alcohol of .10 percent or more is treated as alcohol influence; drug amounts that would impair an average person count as drug influence.
Full Legal Text
Title 18, §343
Crimes and Criminal Procedure, Source: USLM XML via OLRC
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.
Legislative History
Notes & Related Subsidiaries
Editorial Notes
Amendments
1988—Par. (1). Pub. L. 100–690, § 6473(c)(1), substituted “.10 percent” for “.10” and struck out “conclusively” after “shall be”. Par. (2). Pub. L. 100–690, § 6473(c)(2), struck out “conclusively” after “shall be”.
Reference
Citations & Metadata
Citation
18 U.S.C. § 343
Title 18, Crimes and Criminal Procedure
Last Updated
Aug 21, 2026
Release point: 119-102