Opening the article would have allowed you to see that the average was 30.7 ng/mL, it's in the very first bullet point!

using a mean rather than median is fairly odd here. a mean is pretty much worthless without knowing distribution shape.

If you calmed down and stopped snapping at everyone, you might understand that I'm writing about how the law and a lack of studies could make some people more willing to drive high. You are substantially diminishing the quality of the discussion here.

The average (presumably arithmetic mean, though it could technically be any of a wide variety of measures) is not particulatly interesting, the median specifically would be more interesting, as a single figure.