. >> if we keep track of what happens to horses in horseracing, don't we owe it to the athletes to keep track of what's going on in college sports? >> reporter: of the top 25 college football programs contacted by abc news, 16 of them refused to say whether they use toridol. only four including usc admitted they did. armen armistead says he is now fully recovered, and to prove that to nfl scouts, he played in the canadian football league where his team, toronto, won that country's version of the super bowl, and he was named to the all-star team as a rookie, all done without any toridol, a drug armistead says he would like now to see banned. >> if you can't play through the pain, maybe you should just sit out and rest and let your body heal. >> reporter: in our investigation, six of top college football programs told us they do not use toridol, including oklahoma and nebraska, which said they stopped using the painkiller last season following growing concerns about the risks, which by the way, bill, in addition to heart attacks, also include internal bleeding and kidney failure. bill? >>