CFR › Title 33 › Part 95 › §95.03033 CFR §95.030Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkAcceptable evidence of when a vessel operator is under the influence of alcohol or a dangerous drug includes, but is not limited to:(a)Personal observation of an individual's manner, disposition, speech, muscular movement, general appearance, or behavior; or,(b)A chemical test.