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If you really want to monitor for impairment, you could use the tools that are already in place for commercial drivers and pilots. These use functional testing of neurocognitive performance. They don't care WHY, just IF you are impaired (sleep, alcohol, illegal drugs, Rx, ADHD, whatever). The problem is that this isn't cost-effective for roadside enforcement or legislation - not really in full time use even for these industries, unless things have changed. The reason that bars have big parking lots (that stay full until just after last-call and then empty out in a flood of DUI's) is because the distributors have lobbyists, and the bar owners donate to their local sherriff's election campaign. If we really cared about impaired driving (as a society), we could go a hell of a lot farther to curb it. Ask people in Germany how they do it there.
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