the author of a hot dog study that caused sales to plummet was susan preston mark. she's now retired scientist living near los angeles in a residential suburban setting straight out of an american so. after several tense months of talks she agreed to see us. but we had to insist right up until the last minute. the lady is very discreet it's going to go from friendship. mrs preston martin. yes and sometimes you got some french t.v. . i'll tell you. with your discoveries are processed meats the researcher was the victim of a number of attacks but she agreed to look back at her work which showed up link between the excessive eating of hot dogs and certain rare cancers in children. how did you find the relationship. well just the way we always did when we did case control studies we started out with a group of children who had leukemia and compared them to group children who didn't have the game and we asked the mothers about what they fed the children and sure enough the kids with. dogs what did you think when you saw this strong relationship because it was quite a str