My question involves criminal law for the state of: New York

When I was 18 years old I was charged with DWAI, a traffic violation (not Misdemeanor) and my bac was a .07. I was charged as a youthful offender and ended up getting the charged reduced to 2 traffic violations (failure to keep right and disobeying a traffic control device). My attorney told me that I never had to disclose this incident to anyone. Now I am applying to law schools and am wondering if I must disclose this on my law school application. Also, if this "sealed/expunged" event will be in question when I am reviewed for admission to the NYS bar.