Typically, you're going to look for smell, symptoms the person who's impaired might be exhibiting, whether it's red eyes, how they're talking, or slurred speech. You build your grounds that way and conduct the investigation. At a certain point, when you've formed the suspicion that the person's impaired now with a drug, you would bring in somebody who's had the drug recognition training or you'd conduct your own field sobriety test. Our challenge is we don't have any mechanism to quickly test for the substance as we do with alcohol, with the approved screening devices that we have.
If I wanted to make a comparison, the best-case scenario is that we come up with a device, or there's a device that becomes available that allows a police officer on the street to very quickly test for whatever drug and at least determine that there's impairment by drug, and then follow along from there.