malcolm sim was one of the authors. all different parts of the world to come together to review all ofhe scientific evidence. so, in our particular area of expertise and my area was primarily the human studies that have been performed. sean: the who routinely evaluates and classifies substances that can cause cancer. a group 1 classification means. it includes alcohol and tobacco. group 2a means probably carcinogenic, and includes red meat and very hot drinks. group 2b is possibly carcinogenic, and includes things like car exhaust, but also some contraceptive pills and pickled vegetables. the expert panel decided to classify radio frequency radiation in group 2b. malcolm sim: that group concluded that, taking the human evidence and the animal evidence together, there was limited evidence of radio frequency causing cancer in humans. i mean, you've got a whole lot of scientists from around the world, each with their own perspective on the data, i anoften they'll havehole lot oftheir own interpretation,he and so the was no