Well, the sobriety tests are done the same, whether it's for alcohol, drugs, a medical problem, or fatigue. The tests were evaluated in the United States to a blood alcohol concentration of 80 milligrams percent, or 0.08, but the effects of the impairment are the same, depending on what drug it is, because drugs affect people differently.
For example, the depressant category, which alcohol falls under, you'd find the indicia being virtually the same as for somebody who'd had too much to drink. Cannabis, on the other hand, is more mentally impairing than physically impairing, so each category has different things that we're looking for. Although we look at the totality of the evaluation, if the person has problems with the validated clues, then that raises our suspicion that the person is impaired.