Where is Your Driver's License

A policeman stopped a motorist and his friend on the road and after checking his car papers and driver's license which were intact, the following conversation ensued...

POLICEMAN: If you start feeling sick on the steering, who would drive this car home?

MOTORIST: I don't intend to fall sick officer, but thank God I have my friend here. if I fall sick, he will drive me home.

POLICEMAN: (turns to his friend) Where is your driver's license?

FRIEND: I don't have one.

POLICEMAN: You are under arrest for intent to drive without a license!