and sane enough to tell the truth, she believes. yet the federal government has allowed him to go free. >> they know that my brother is innocent, 100%. >> according to this fbi affidavit, investigators learned of stockton's knowledge to the crime when stockton talked about it in a monitored phone call from jail. stockton was released then given immunity to testify for the government in the pizza bomb case. >> my name is kenneth eugene barnes. >> there is also the testimony of this man, kenneth barnes. >> like i say, i'd never kill anybody. >> barnes pled guilty and is serving a 20-year sentence for his role in the case. but it's this fbi search warrant affidavit now obtained by cnn which raises even more questions about why jay stockton has been allowed to go free.