Please excuse me for trying to make this too simple but to me, it is obvious what Clemens is trying to do. He is concerned that someone else with more credibility, say another player, will say that they saw him being injected so he cannot simply deny the allegations. Instead, he has to admit to the injections but claim that the substance was legal. Palmiero tried this saying it was B-12 that he got from Tejada, problem is, Tejada has now been implicated.
What is amazing about golf is how tough it is out there for professional golfers where one or two strokes can make a huge difference, yet we never hear about cheating. I'm not talking about steroids, I'm talking about moving a ball, taking improper relief, etc. Playing as threesomes on a Thursday with few, if any ,spectators can lead to a great deal of temptation when a player is in the trees away from his playing partners. Guys are trying to make a living and keep their playing privileges - they don't have long term contracts and there are no guarantees in their sport. It is a credit to the game that there isn't a need for someone to be assigned to each group to be certain that there is no fudging.