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In my world , sources at the FBI have said that the program was ineffective because they were wasting time tracking down complete crap . They agree that Hosty told Revill that the FBI had known about , Oswald and , in particular , of his presence in Dallas and his employment at the Texas School Book Depository Building . In addition , government agents admitted that the FBI had tampered with evidence and that the crime scene photos given to the defense were phony reenactments . By the end of June , the FBI had reviewed the testimonies of and the evidence linked to the suspects in custody . The following is a sample of some major counterintelligence cases the FBI has helped investigate .