Years ago when I was in college, a classmate of mine has a similar experience. He was coming out of a city centre nightclub. There were a couple of altercations involving the patrons spilling out. The Garda arrived. As well as picking up the people involved in the altercations, they also picked up a number of people who had no involvement, including my classmate.
He was summonsed to District Court on drunk in public place, danger to ones self etc. He questioned the charges with the Garda, but the answer was along the lines of ...."we know you had nothing to do with the altercations etc......but you were drunk etc....just your bad luck that we came across you when we were dealing with an unrelated incident etc..."
Went to Court, but faced with admitting that he had been drinking all night and the arresting Garda saying that the picked him up because he was uneasy on his feet, all he could do was apologise and offer to pay money to the poor box. He doesnt believe he was that bad on the night in question, but, drink can impair your preceptions. He didnt think it would be worth arguing that after being drinking for appro. 6 hours solid that he was sober and steady on his feet.
People who are drunk often over estimate their capabilities - they walk down streets convinced they are going in a straight line, but everyone can see they are staggering. People who have one too many do not realise how drunk they can look to others. Could you friend fall into this category?
The summons also included a charge of giving wrong name to gardai
Has he spoken to the Garda in question and pointed out this mistake?