It is known that people should not drive drunk. There have been many fatalities due to car accidents caused by drunk drivers. Bars have stopped serving intoxicated people after the bartenders think they have consumed too much alcohol. Also, people usually have a designated driver who does not drink, who will drive them home. If I was with a friend who was drunk and they were to drive me home I would not get in the car with them.
Even if this was my only option, I still would not get in the car with them because it is very dangerous. I would call a taxi and the taxi would drive both my friend and me home.