Replying to Going to court soon... anyone help me out?

iight so i was at a concert and my friend was plastered and falling everywhere. we were standing in line and a cop comes up to us and is like come with us...i had some alcohol in my body and we are both underage..

so now im handed a ticket that says "Posession of Alcohol" and i did NOT have any alcohol on me except for the fact that i was a little impaired.

what im asking is when i go to court..will i instantly win the case because they clearly cant prove i have any alcohol on me? or does that include having alcohol in my body as well?