Testimony of Andy Pettitte provided at court related to Roger Clemens was shocking

The desire of the federal government linked with the case of Roger Clemens was following: they wanted to prove that this athlete had lied before the Congress about usage of anabolic steroids and HGH. But the government couldn’t reach this goal. It was expected that Andy Pettitte would tell the jury that Roger Clemens had acknowledged that he had applied the forbidden medications during a conversation in 1999 or in 2000. But the affirmation of Andy Pettitee was shocking for prosecutors. This man said that he couldn’t confirm that Roger Clemens had used steroids and HGH because he was not sure.
Actually, did the testimony of Andy Pettittte shock the prosecutors of Roger Clemens? This man swore for the 2008 Congressional hearings on application of steroids in the Major League Baseball that Roger Clemens admitted to usage of HGH. But he pronounced opposite testimony at the Barrett Prettyman Federal Courthouse in Washington.
Michael Attanasio, a defense attorney for Roger Clemens, asked Andy Pettitte whether he can say that he is 50-50 that he has understood wrongly Roger Clemens about HGH. Andy Pettitte answered that he is actually 50-50 about this aspect.
When the prosecutors heard the answer of Andy Pettitte, they became confused. They stated that Pettitte never answered this way, when he was asked several times.
The judge Reggie Walton noticed that he understood that Andy Pettitte’s answer has been conflicted. Actually, his testimony was following: “I don’t know”.
The attorneys for Roger Clemens used the moment of the federal prosecutors’ embarrassment. They asked the judge to brush aside the testimony of Andy Pettitte because he was 50-50. The attorneys claimed that he probably misunderstood Roger Clemens or he forgot the details of the conversation.  
The government has stated that the jury still allows considering the affirmation of Andy Pettitte. ASUSA Dunham has pointed out that under federal rules jury is allowed to choose which testimony to believe. He hopes that the jury will disregard the testimony that doesn’t support the government.
So, the testimony provided by Andy Pettitte and his wife led to problems. Testimonies of his wife during the first trial led to the declaration of a mistrial by the judge Walton.
Pettitte confirms that he is Roger Clemens’ friend. Clemens must also confirm that they are friends after Andy  Pettitte’s last testimony.