You have every right to be mad at your ExH for not letting you know. That was irresponsible on his part. Teenagers will be teenagers, unfortunately, and do these stupid things. I am not saying its right or ok by any means, but I was there once and remember all too well how stupid we were.

Have a serious talk with your daughter, and let her know what they did was wrong, getting into a car with someone who has been drinking is very wrong and dangerous. Give her the # to taxi companies in your area and tell her to use it and that you will pay, no questions asked. You can tell them NOT to do these things until your blue in the face, but if they want to do them they will find a way. Its up to you as a parent to teach them to at least be safe in these situations.

I have always told my son, "if you cant be good at least be safe" when he goes out. He is 17, and I am sure does things I may not like. He is free to call myself, my DH or his father ANYTIME he or his friends need a ride, no matter what, with no questions.