Thats bull. Be honest and you will be fine. I had a disorderly conduct that was dropped, a time when I was cited for underage, posession of a fake ID, and public intox. (plead down to public intox.), AND a weapons discharge when I was a kid. I got into GW. The schools don't care what you did as long as there isn't some long pattern of mistakes. Also, they want honesty. That is all. Really, its for our own good. By disclosing everything now, we know we won't have trouble getting in the bar.
Also, even though people say you can get kicked out etc... I highly doubt that ever student in law school tells the truth on their applications. I did, b/c I have nothing to hide, but I bet plenty of ppl. leave out juvenile stuff b/c the fact is, it won't ever be found. However, my theory was better safe than sorry. Just be honest and you have nothing to worry about.