So it's important that there is a mechanism where people who are using the road know that they can be tested and assessed. When it comes to pharmaceutical prescription medicine, there is evidence that people do become addicted and/or choose to abuse pharmaceutical-prescribed medication. When we're thinking about the purpose of the bill where we would want to know are people impaired, well, for substances that have been through an approval process—a Medsafe or an Australian Therapeutic Goods Administration assessment or a United States Food and Drug Administration assessment—you could be pretty confident that when somebody takes a pharmaceutical product that causes impairment there would be quite a bit of information about that. We would know, say, the level of a drug, what it does to somebody physically, because it's been tested in a laboratory. It's been tried and tested and tried and tested. And there will be reports, stacks of reports that tell people who want to make decisions about impairment and whether you take your medication, whether you're safe to operate a digger, whether it's safe to drive a truck on the road or a private car on the road; there'd be plenty of information about that.