U.S. District Judge Reggie Walton declared a mistrial in the Roger Clemens perjury case over inadmissible evidence shown to jurors.
Walton said Clemens could not be assured a fair trial after prosecutors showed jurors evidence against his orders in the second day of testimony.
A September 2nd hearing will be held to determine whether to hold a new trial.
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"There are rules that we play by and those rules are designed to make sure both sides receive a fair trial," Walton told the jury, saying such ground rules are critically important when a person's liberty is at stake.
"If this man got convicted, he would go to jail," Walton said.