I had a question about a link you posted concerning ETG/ETS Tests. http://alcalc.oxfordjournals.org/content/44/1/55.full.pdf+html. On page 59, what does the g/kg alcohol number mean? How many g/kg is in 3 to 4 standard 12 oz. 4.5% alcohol beers? Or per beer? Also, how common are these tests used? Are they mostly bigger, more heavily funded places like large cities and for alcohol rehab programs?

Thanks,
SM