I don't know. I don't have any, specifically. I've done some research, but I have the same access to what you have.
We're trying to review as much as we can. Generally, our initiative is more focused on drug-impaired driving as a whole, as opposed to specifically for an individual drug. I certainly agree that many of the studies out there show that if they're using cannabis, they're likely to use alcohol and cannabis together.
I don't know, Darcy, if you want to comment on the DRE program, as far as recognizing the symptoms when individuals are using both substances is concerned.