1998 – Mark McGwire Admits to Using a Steroid Precursor

“A jar of androstenedione is discovered in the locker of St. Louis slugger Mark McGwire, who is neck and neck with Sammy Sosa in the great chase at Roger Maris’ all-time record of 61 homers hit during the 1961 season. McGwire admits he uses the steroids precursor [substance that the body can convert into steroids] and goes on to hit a then record 70 homers. Using steroids, precursors or performance-enhancing drugs is not illegal at that point in Major League Baseball.”