An autopsy found alcohol in the blood of the 18-year-old who was at the wheel of a car that crashed Sunday in northeast Iowa, killing the driver and three high school classmates. The county prosecutor vows to find whoever supplied Nathan Chopard of Edgewood with the alcohol.Delaware County Attorney John Bernau says the driver was legally intoxicated at the time of the crash. Bernau says there are hefty penalties for adults who give alcohol to underage kids, five years in prison, a 75-hundred dollar fine, or both, if the underage kid dies as a result.The investigation could involve people in both Clayton and Delaware Counties since the Edgewood/Colesburg area is on the border of those counties.The teenagers died early Sunday when their car veered off a highway, crashed into trees and burst into flames. Funerals for the four victims are scheduled later this week.