It's common in PA. Drunks can't be locked up unless they're considered a danger to themselves or others. With DUI's once they're processed and if a third party is willing they're released with a court date.

Unlike a lot of states, when you're arrested in Pennsylvania, you're not automatically locked up in a county jail. Lancaster county also doesn't run a central booking center with the sheriff's office for processing of an arrested person. So they're released. More than likely this person went home, got his keys or spare keys and went got his car. Well as he was driving, he got caught in a DUI checkpoint where he was arrested again for DUI. This time he had a bail hearing before a district justice and was remanded to Lancaster county prison.