I'm not suggesting they did anything wrong. I'm just explaining to parent commenter that you don't simply "explain" your way out of a DUI. The more you talk the more evidence you stack up against yourself for the courts.

And the guy refused an ambulance. You can't force someone to take an ambulance. If they called an ambulance, the ambulance would have shown up asked him if he needed treatment, he'd deny, they'd leave, he'd get in his car and drive drunk. They probably wouldn't have arrested him if he'd been willing to accept an ambulance and a ride to the hospital.

You can't just let the guy walk away either though. I see a ton of people on reddit saying they should have just called him a cab or a relative to pick him up. Sure. Then when he decides he's good to drive a few hours and drinks later and he needs to get his car before it gets towed, then ends up killing someone- those cops are fucked.