Driving while intoxicated is against the law, and most people understand that. There are cases when people seem drunk and aren't due to medical conditions, have had a drink but are tested positive with a malfunctioning Breathalyzer or have gotten drunk without knowing they've had anything to drink. People in these situations have a strong defense against charges, even if they're involved in an accident.
Drunk driving accidents are horrible for everyone involved. In this case in Minnesota, a man rolled his vehicle over and then got a ride to a local McDonald's. The March 23 report states that the man failed to call 911, even though his friend was at the scene dying from his injuries.
The 39-year-old man was charged with criminal vehicular homicide after the wreck. He reportedly got a ride to McDonald's and then was caught by police shortly thereafter. He was found with a marijuana pipe and a cellphone, which he allegedly did not use to call 911 or to report the crash. The two surviving men, the driver and a passenger, had their blood alcohol concentrations tested. They came back around 2.5 times higher than the legal limit. The second passenger died following the crash.
While police feel they know what happened in this case, it's not always so black-and-white. In your case, you may not have called 911 due to a concussion or confusion from injuries. There are many explanations, and you have a right to tell the court yours. A defense can help you protect yourself against an unfair assumption that you were negligent.
Source: StarTribune, "Charges: Drunken driver rolls car in N. Minn., kills friend and goes to McDonald's," Paul Walsh, March 23, 2017