Can lack of changes in physical appearance of Roger Clemens prove that he hasn’t used steroids?

It is known by each baseball fan that Roger Clemens is accused in obstruction of justice. It is said that he has lied before Congress about administration of steroids and HGH.
Rusty Hardin noticed that there was no any difference in physical appearance of Roger Clemens before, during and after his trainings with the coach Brian McNamee. He affirmed that this aspect was a proof that Roger Clemens hadn’t taken steroids and other related medications.
Enhancement of muscle mass is commonly utilized by federal prosecutors as proof that an athlete takes steroids or/and other performance-enhancing drugs. But this tendency was not utilized during the governmental case against Roger Clemens. Nobody could claim that Roger Clemens’ muscles manifested that he had applied steroids and HGH. It is one of differences between the cases against Roger Clemens and Barry Bonds.
When it comes to the governmental case against Barry Bonds, feds called numerous persons in the trial who were able to testify that anabolic steroids promoted evidential changes in physique of this athlete. They affirmed that application of steroids led to increase of muscle size, enhanced size of the head and testicular atrophy in Barry Bonds.
Thus, Rusty Hardin provided 4 photos of Roger Clemens. The pictures displayed physique of Roger Clemens, including the time when Clemens was working with the trainer Brian McNamee. Hardin noticed that the pictures manifested that there was no difference in physical changes that could manifest that he used steroids and HGH.
The attorney Rusty Hardin claimed that the photos displayed just the process of ageing. The masseur Cheryl Redfern also claimed that she didn’t observe any changes in physical appearance of Roger Clemens. Roger Clemens had neither back acne, nor abnormal development of breast tissue, nor dramatically increased muscles.
The former Major League Baseball player Phil Garner also confirmed that there were not any essential changes in physical appearance and performance of Roger Clemens during working with the coach Brian McNamee.
Steve Durham, the Assistant US Attorney tried to discredit the affirmation about lack of physical changes in Roger Clemens during the cross-examination of Garner. He claimed that while several steroids enhanced muscle size, others didn’t induce increasing muscles. So, he confirmed that the photos could display nothing about steroid use.
Feds want to take advantages in both cases: in the case against Roger Clemens and in that against Barry Bonds. While they claim that physical changes in Barry Bonds manifest that he has utilized steroids, lack of physical changes in Roger Clemens doesn’t prove that he hasn’t used steroids.