A teenage girl in New York called 911 operators to report that her mother was under the influence of alcohol and driving erratically on I-84.  The teen was in the car with her mother and dispatchers reported hearing arguing in the car.  The girl initially reported that she was fearful because her mother was driving erratically and speaking incoherently.  When police arrived, the car was parked on the side of the road.  The mother failed the field sobriety tests and was arrested.  Her blood alcohol content was later recorded at .18, more than twice the legal limit.

http://www.cnn.com/2010/CRIME/07/28/new.york.teen.911.mom/index.html?iref=allsearch