I think we can all agree that a certain degree of carelessness was involved,...
The term is "negligence".
I'm not looking to pillory this "friend", but neither am I willing to excuse his clear violation of state law on account of the fact that in his impaired state he filed a false police report. He needs to answer for this. Hopefully, the judge will see the intent to comply with the law in spite of the fact what he was reporting was wrong. I also hope your "friend" will either discover AA or the Sinclair Method for dealing with his drinking problem.
By the way, the Sinclair Method worked wonders for me.