>> we do a lot of role playing. we talk about drinking and driving so i'm curious to see what happens. >> and there's one more thing about this group that could be a game changer. a tragedy in nicole's family. her mother's brother killed before nicole was ever born. >> i lost my brother to a drunk driver. >> reporter: it was 1986 when her brother got in a car with a drunk driver. >> my brother was 22. he was just graduating college. >> reporter: how much did that affect you at that time in your life? >> life has never been the same and never will be, ever. >> reporter: nicole's mom says she's made it clear nicole is never to get in a car with anyone who's been drinking. >> she does know that if she finds herself in a situation where maybe the designated driver is drinking, she can call me anywhere, any time, we will come and get her with no questions asked. >> still, nicole's mom is not certain about what her daughter will do today. >> i hope that she doesn't go. >> reporter: and what does our expert think will happen?