As much as I don't really like Manning he's one guy i can forgive for taking HGH, given his spinal injury - assuming that's when he started taking it.
ETA: He should come clean though (if he did it - which is looking increasingly likely).
Of course Peyton Manning took HGH. He's a high-profile athlete. They never beat these raps. He did it. Dude had an insta-retirement neck injury. A never-get-strength-back-in-the-arm never-never-ever injury ... and he comes back to still be a top-level QB? Come on.
News flash: Adrian Peterson took a boatload of PEDs to come back from his insta-retire knee injury a few years back, too. They're high-profile athletes -- they do PEDs to beat stuff that caused retirements 20 years ago. All of them, every time.