It was California Law at the time. I have no idea if the law is still on the books or not, it was often referred to as the "Good Samaritan Law".
You could not only be sued for NOT giving assistance, but if you gave improper assistance after passing the course, you could STILL be sued. Yes, in civil court.
Well, I was wrong, according to this:
"The caller was not required to stay in the area and wait for emergency workers or the N.C. Highway Patrol to arrive, said Robbie Stone, emergency services assistant director."
Also, it was not just the State Patrol that went to the scene after the original call; it was EMS, Nash County Sheriff, and the NC Highway Patrol.