anthony galea will talk with the fbi about who he treated and how.r medical correspondent elizabeth cohen here to talk about doctors he transported and we're talking about big-name athletes, too, right? >> right. during the proceeding the judge forced the prosecutor to some of them, and tiger woods is one of the athletes treated by this doctor. as well as some nfl players, some other golf players. but it was interesting, he didn't say that these athletes had gotten these treatments but just that they received treatments from this doctor. >> what do we know, first of all, about this human growth hormone? >> right. it's a real fda-approved drug. given to people for various things, but the people with medical conditions. it not supposed to be given to athletes to help build their muscles but it is illicitly used this way and sporting organizations like major sports -- professional -- i'm sorry, i'm not a sports reporter so i'm flailing but athletes are not supposed to be using it just to build muscle. >> there's guidelines. but there's another drug, too