My Friends 25 Yo Danish Son Was Arrested In Iowa For Walking Home After Drinking Two Beers In A Bar.

Apparent it's a crime in Iowa to walk home after having consumed alcohol. It's his first time in the US and he's there as an exchange student. On the night before going back to Denmark, he was invited to a bar to get a couple of "farewell beers" with some of his fellow students. After having two beers in the bar, he decided to just walk the 600 yards as he couldn't get an Uber. College police stopped him as he was walking home. They asked him if he had consumed any alcohol, to which he said yes..."two beers". He was immediately arrested, and spent the night in the local (20 minutes away from where he studied) jail. He was released the next day, but told to meet in court some days (weeks?) later...he would receive anything ranging from a $200 fine to 30 days in jail. He didn't want to miss his flight back to Denmark, so he did not show up in court... So.. My question is: will him not showing up in court in Iowa prevent him from entering the USA in the future?