> things like the ability for your eyes to smoothly track a moving object, or the ability to stand on 1 foot for 30 seconds while counting I could easily do al

> things like the ability for your eyes to smoothly track a moving object, or the ability to stand on 1 foot for 30 seconds while counting I could easily do all of those things and still be too impaired to drive safely. So it's useless even if the officer has the best of intentions.