On many occasions I let my girlfriend drive if I had been drinking. O'Leary is a wine buff so it is not out of the question that he let his wife drive home, assuming she was not drinking, which the breath analizer confirmed. This would be sensible, responsible and therefore could have been the case. Personally I find O'Leary unbearable as a tv personality but that is not a crime (but maybe it should be, lol)