Legal questions posed by friends and family are expected by most lawyers. What is unexpected is one recurrent question.“Should he blow?”Other lawyers who double as parents of high school- and college-age drivers will surely relate.Never mind the field of practice. Real estate, patent prosecution and ERISA lawyers will all be approached by parents seeking advice for their kids. If and when they get pulled over by a law enforcement official showing interest in their blood-alcohol levels, should the kids &ldquo …