How were the lies about lab results in those FBI cases you referred to proven/shown? By the lab reports themselves? Just curious.
Testimony of Frederic Whitehurst at the (1st) World Trade Center Bombing Trial, August 14, 1995
Tainting Evidence, a book by John F. Kelly and Phillip K. Wearne, about the FBI lab scandal
1997 news summary: News reports in late January about possible taints in laboratory work done by the Federal Bureau of Investigation provide additional grounds for skepticism about law enforcement scientific evidence. Justice Department officials have told prosecutors and defense lawyers around the nation about potential flaws in evidence handled by the lab. According to the Albany Times-Union on January 31, there have been allegations not only of sloppy procedures, but of pressure brought on lab employees to alter conclusions and of changes made by supervisors to lab findings for the purpose of supporting criminal prosecutions. As of February 14th, fifty prosecutors had been notified of cases in which problems might be raised by the defense, according to The New York Times.
A link to a 1997 article about the impact the FBI scandal might have on the McVeigh case, pending at that time.