It was expected that Andy Pettitte would say that Roger Clemens admitted to usage of banned drugs

The desire of the federal government connected with the case of Roger Clemens was following: they desired to prove that this sportsperson had lied before the Congress about usage of anabolic steroids and HGH. But the government was not able to achieve this goal. It was expected that Andy Pettitte would confirm that Roger Clemens had acknowledged that he had taken the banned products during a conversation in 1999 or in 2000. But the statement of Andy Pettitte was shocking for prosecutors. This man claimed that he couldn’t confirm that Roger Clemens had used steroids and HGH because he was not sure.
In fact, did the statement of Andy Pettitte shock the prosecutors? This man swore for the 2008 Congressional hearings on application of steroids in the Major League Baseball that Roger Clemens admitted to administration of HGH. But he provided 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 factor.
When the prosecutors heard the answer of Andy Pettitte, they didn’t know what to do. They stated that Pettitte never said this way, when he was asked several times.
The U. S. District Court Judge Reggie Walton noticed that he understood that Andy Pettitte’s answer has been conflicted. In fact, his statement was following: “I don’t know”.
The attorneys for Roger Clemens utilized the moment of the prosecutors’ confusion. They requested the judge to ignore Andy Pettitte’s testimony because he was 50-50. The attorneys claimed that he probably misunderstood Roger Clemens or he can’t remember the details of the conversation.  
The government has stated that the jury still allows considering the affirmation of Andy Pettitte. ASUSA Dunham has claimed that under federal laws jury is allowed to choose which affirmation to believe. He hopes that the jury will ignore the testimony which doesn’t support the government.
Thus, the testimony provided by Andy Pettitte and his wife caused problems. Testimonies of his wife during the first trial resulted in the declaration of a mistrial by the judge Walton.
Pettitte claims that he is a friend of Roger Clemens. Clemens must also confirm that they are friends after Andy  Pettitte’s last testimony.