I'd be shocked if Jeter was. There are tons of guys who were both on the Sox and Yankees but I think you can tell by just looking at them. A-Rod is a physical freak the guy is huge, I always wondered but just assumed he was blessed physically beyond any one's imagination and had a great set of skills to go along with it. This is different from Giambi who grew out of nowhere and never the set of skills to make him great. He went from an average player to a lean beefed up MVP type player.
People who yell at Sox fans and say they are in denial are wrong. Yes I do not think Pedro, Manny and to some extent Ortiz were on the juice because of how they are built. Pedro is a string bean. Manny and Ortiz have nowhere near the muscle that all the guys being named do. I think all of Mannys success comes from his swing not his physical ability. When you look at Manny you would think I'm a better athlete then him. Granted Ortiz has declined so that does raise speculation but I don't think so. Guys like Tek, Millar, Nixon, yea I'd say there is a high probability there were on it at some point. As for Jeter no way. He is in great shape but nowhere near as jacked as the guys on the list.
As for Pujoles I hope to God he isn't but I wouldn't be surprised he, like A-Rod, is a freak of nature. I'm going to be an optimist and say no but I can be completely wrong. I think its wrong to accuse guys like Jeter and Manny because of this when steroids don't fit their physical description and game.