Hey, that link was written by an attorney who specializes in drunk driving defenses. That's a bit biased.

Here's one that seems pretty unbiased, and gives studies, along with the history of how the standardized tests came into effect. It also mentions that there are certain specific "coordination" tests that are nationally recognized/preferred. It's long, but it mentions pros and cons. So if you are interested in it,
take a look at it.