Completely against the law. In fact I think SA does no-refuse road side blood tests too.
Hmm, I haven't seen this, but then again, I wouldn't be surprised. Better than it was in Connecticut, where we'd hit 2-3 DUI checkpoints before we got home near a holiday.
Bexar county regularly has "no refuse" breathalizer tests if you get pulled over. Usually on holidays or big "drinking" days. I believe open containers are banned state wide.
It's not entirely true, the second post. There are no-refusal weekends, but it's not a permanent thing. Also, while you cant just drive around with open containers, if you're cruising a river you're allowed to have open beers there. Just gotta be smart. But yeah, Texas being a freaking blue law state and all you're not gonna get much leniency in alcohol related matters/