That's not quite correct - once he is convicted of the first DUI, the second conviction is considered a second, regardless of whether the conviction happens in the same proceeding.
You are right though that while the charges are pending, they are both considered first offenses.
bendersuperpower t1_irc62ub wrote
Reply to comment by HarrowingChad in Lancaster man arrested twice in one night for DUI. by basement-thug
That's not quite correct - once he is convicted of the first DUI, the second conviction is considered a second, regardless of whether the conviction happens in the same proceeding.
You are right though that while the charges are pending, they are both considered first offenses.
75 Pa.C.S. 3806 is the statute