My inclination is to believe that the charges are valid since he's chosen not to issue a counter statement.
As someone said, he's been in the US for a several years now, obtained a driver's license (which should imply a knowledge of driving laws) and is older than he was during the alleged COI incident (I say alleged here because I'm not aware of anything official.) Also, as a resident of the US, I'm surprised he didn't consider that police are out en force to watch for DUI/DWI during holiday weekends. He definitely used bad judgement.
Assuming that this is his 1st official conviction, he'll probably get a slap on the wrist and community service. I think the penalities for DUI and DWI are amazingly lenient in this country considering the potential severity of the issue.
Is he an alcoholic? I don't have enough knowledge of his behavior to decide. While it's unlikely that he could perform on tour while drinking, the tour's been over for several months now.
There are functional alcoholics out there. Many people imagine alcoholics as someone who drinks constantly. That's the most severe case. An alcoholic is anyone who "needs" a drink. It could just be that one drink in the evening, but if it can't be skipped, the person has a problem. If you can only have fun with a drink, you've got a drinking problem IMO. If you never turn down a drink, you have a problem.
My cousin's boyfriend was a functioning alcoholic. I'm not sure when it started since I really never spent a lot of time with him - when I did, it was usually a social situation. He never seemed to get 'trashed'. Based upon what I've heard, the situation got worse after he lost his job - that's when the binge drinking started. Less than 2 years after he lost his job, he was dead. Too much liver damage. Believe me, I was shocked. He managed to hide it from my cousin until after he moved in with her (while he was unemployed.) So, don't assume that the social drinker isn't an alcholic.
Another former co-worker was concerned that he was drinking too much - so, he put himself to a test where he wouldn't drink for a week, even when we went out for happy hour. He passed his test without a problem.
On the other hand, another former co-worker continued to use the excuse that he was young and partying to permit himself to drink. His-then-girlfriend told me that he had to have a drink every evening for stress relief. I asker her if she thought he had a drinking problem and she said 'no. She got tired of all the times she had to bring him home blind drunk. You never saw him like that at work, but on any social occasion outside of work, he never turned down a drink.
Sorry, don't mean to get preachy. Can't cast stones since I've been drunk, especially when I was just out of college. Fortunately, I had a 1 hour train ride home and always stopped at least an hour before leaving the bar. If I know that I'll need to drive, I set a drink limit and a time limit. Otherwise, I got a ride from the designated driver or had plans to stay over. Like the campaign says - If you're going to drink, do it responsibly.