That would be correct, yes. For a paragraph 253(a) charge, there first of all has to be evidence of impaired driving. If they don't feel it's alcohol and they think it's drugs, if this legislation were to pass, the person would then be demanded to do roadside screening, like the standard field sobriety tests at the roadside. If they were to fail those, then that would give the police the opportunity to demand that the person complete a DRE evaluation, which is much more intensive and takes longer to do. It looks at clinical indicators as well as some of the standard field sobriety tests. If the DRE then says, yes, this person is impaired in their ability to operate a motor vehicle, and they are able to identify the drug class, then they will demand a sample of a body fluid—it could be urine or saliva or blood—for analysis by the lab to corroborate that finding.
On June 12th, 2007. See this statement in context.