Sorry I didn't link any of this. I wasn't aware that linking is a requirement for comments. Have a good day.
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.
Apparently in 1999, California amended the laws to remove liability from Good Samaritans who performed assistance in good faith.
http://www.swc.cc.ca.us/~kjacobs/goodsam.htm