. >> reporter: when our under cover athlete lim collins met charlie sigh as part of our investigation, sly immediately demonstrated his knowledge of drugs offering lee am an an bolic banned substance in sport. more than 27 hours of recorded conversations, sly gradually opened up about his contacts with athletes. statements he now denies. his most controversial allegation is that when he did part of his pharmacy training at an anti ageing clinic, human growth hormone was shipped to peyton manning's wife >> we would be sending ashleigh manning drugs. it would never be under peyton's name. >> reporter: since then the clinic claimed he was only there in 2013 after the mannings moved away to colorado, not 2011 as al jazeera originally reported. now al jazeera is releasing the phone call we made almost a month ago to confirm the dates of sly's rotation. >> thank you for calling the geyer institute. this is heather can i help you? >> yes. i need to do an employment verification on a video called charles sly. he is a pharmacist and i believe he did a rotation with you. is that right? do you k