This happened in France to an Englishman who was totally drunk.
The French policeman stops his car and asks the gentleman if he has been drinking.
With great difficulty, the Englishman admits that he has been drinking all day, that his daughter got married in the morning to a French man, and that he drank champagne and a few bottles of wine at the reception and quite a few glasses of single malt thereafter.
Quite upset, the policeman proceeds to alcotest (breath test) him and asks the Englishman if he knows under French Law why he has just been arrested.
The Englishman answers with humour: No, but do you know that this is a British car and my wife is the driver… on the other side???