The Defense uncovers a mystery for jurors about the case that remains unsolved to this day. They attack the integrity of the FBI Lab, and show jurors how one major finding on the only piece of physical evidence from the Ryder Truck with chemical residue can't be verified. Find out why on this, the final episode of our case study on Timothy McVeigh's trial. The entire transcript is available at Oklahoman.com. Based on these transcripts, the first 6 episodes document the trial. In the next 3 episodes, you'll hear the full interviews from Mr. Mackey, Mr. Jones and Mr. Tritico. In the final episode of A Murderous Design, we sit down with journalist and Timothy McVeigh Biographer Lou Michel, who, along with Dan Herbeck wrote the New York Times Best Seller "American Terrorist." Visit AMurderousDesign.com for more information about the trial, including the script and a unique, interactive trial visualization report where listeners can view summaries of the trial based on witness and subject matter.