Education is almost always the answer, give them a good link that establishes the widespread use of performance enhancing drugs that permeate sports, cultures, and film.
I just say no, and tell them its called working out and eating. If they are anybody other than my wife (which she knows) or a close friend, they better not push the issue.
I tell them I eat small children. My emotionless face usually instills fear in them and they don't ask me anything else.
Nobody needs to ask me lol.. most people know if they have half a brain. I do get asked a lot by new comers though. I just tell them the truth. It makes me sick when people lie about their use unless they're trying to get sponsored or already are sponsored...
felony charges for steroids? Wtf?