This is a weak argument against checkstops. If you're a worse driver without alchohol or other relevant impairments then you shouldn't be driving either. I can't see road signs very-well without corrective lenses, so I don't, and I wouldn't pass a test without them. If you need alchohol to be a good enough driver, you probably won't pass the test sober, or we should have better tests. Moving cars are killing machines unless you're driving them well. I've been stopped at checkpoints and support them. They're scary, but driving is a priviledge and you shouldn't fuck around with it.
They're also not a solution to road safety, they just address one category. Overall road safety comes from a complete reversal of car-dependance along with improvements to road design.
