Drunk driving seems like the go too culprit in any situation were alcohol is involved. It makes the investigation easy, if there are survivers just blood sample them and the state picks up $10,000. They could have .01% bac and still get a duii. Also, people have different tolerences. A veteran drinker might operate just fine at .12%bac. 

I'm not saying I support drinking and driving, quite the opposite. It's just holding police and investigators accountable for there comments to the news before the investigation or toxicology results are in.