We assume Griffey was clean because he never showed a single one of the hallmark signs for steroid use -- extreme muscle increase, bigger head, acne , etc. Further, most "baseball people" tend to agree that Griffey has a textbook perfect swing for hitting HRs, meaning that he didn't rely on sheer muscle to hit the ball. Griffey's uses flexibility and quick reflexes to generate batspeed, not his triceps. One last thing, Griffey was injured all the time. Guys on the juice don't spend much time on the DL with injuries. Part of what steroids do is cause your body to heal at an extremely fast pace (keep in mind that your body healing itself after a workout is what actually builds muscle). Griffey just never fit the mold of a steroid user. i never saw any huge size difference in alex sanchez or rafael palmeiro. Griffey is clean. He's just too nice to use steroids.