Lesser of two evils, but what would you do?

[milkmania]

A good while back, my 15 year old son (14 at time) and I went over to a friend's house...
I had a couple of drinks, we left before dark so I asked my son to drive home.
I can get a DUI if I blow 0.02, and he can get a ticket for no driver's license.
And I'd probably get a ticket too...
Calling a cab in this area is not an option. I guess we could have phoned a friend
What would you have done? I've had my kids behind wheel pretty regularly from 12/13 years old on, in non-public areas.