That's the legal limit for Texas in DWI. Over the years (many years, that is), I've seen lots of cases between .10 and .19, and a couple of times a year I'll see something between .20 and .29 (that's pretty rare, and normally gets everybody's attention.) I saw one case over .30 when I was a prosecutor in the Tarrant County DA's office and that was my first year there. I kind of wish I could look at the file again - I didn't know it was going to be such a rarity. I have always heard that "over .40" can kill you. I honestly can't recall a specific situation where I've seen that to be true. But today I read about one in Dallas.