Alex Rodriguez suggested in his interview with Peter Gammons on Monday night that he tested positive for performance-enhancing drugs due to tainted dietary supplements. However, doping experts are saying that A-Rod's explanation sounded far-fetched. Sports Illustrated reported that Rodriguez tested positive in 2003 for testosterone and an anabolic steroid known as Primobolan. "You can't blame Primobolan on a supplement," said Gary Wadler, a New York University steroid expert and an adviser to the World Anti-Doping Agency. "Primobolan was never available that way." When asked how he was introduced to such supplements, Rodriguez responded with the following: "The culture, it was pretty prevalent. There were a lot of people doing a lot of things. There was a lot of gray area, too. You know, back then you could walk in GNC and get four or five different products that today would probably trigger a positive test." Experts claim otherwise. "You have to get substantial blood levels to test positive and the only way to do that is through an injection," New York sports medicine physician Dr. Lewis Maharam said. "If this truly is a testosterone positive test, he couldn't have tested positive because of a product he got from GNC that has since been discontinued."