That preamble would perhaps underline the seriousness of impaired driving and the necessity to establish a simple and effective way of determining a person's BAC.
Back in my office I have a stack this high of legislation from around the world, many of which have preambles outlining why the legislation is being passed and so on.
I wouldn't be able to say at this stage. It would be an issue to think about in terms of the drafting, but those are certainly some of the possibilities.