Quick search says pretty much anything you operate while drunk will get you a DUI. I mean I know people drunk bicycle around boston all the time without a thought. But a moped will definitely draw a lot more attention. I'll still do it, since I drink like a *** anyway. Fact remains I could park my car 2 miles away and still get to the bar in less than 5 minutes. I haven't had more than 4 beers in a whole night drinking in awhile and I don't think a cop would have any reason to pull me over. Also the kid I know with one said it's sick driving around boston on weekday nights where it would usually be packed. That's sounds sick even dead sober.
Not to mention I can always just decide to weld the chainsaw to the front of it. That would be cool too.