I trained as a school bus driver, and when we got drug tested, a lot of over the counter stuff could show up. We were also not allowed to drive under the influence of any drugs that had not been cleared, even prescription. And clearing a drug was on a case-by-case basis, though it mostly operated on the honor system.
> Ibuprofen can cause blurred vision, drowsiness, and dizziness. Do not drive or operate heavy machinery until you know how ibuprofen affects you