Warning: This episode contains details of gun violence against children. The man who taught police departments around the country how to analyze bloodstain patterns went on to testify in one of the most famous cases of the 20th century: The OJ Simpson trial.  But in the case of Indiana state trooper David Camm, the interpretation of just a few specks of blood sent him to prison for the murder of his entire family-a crime he was acquitted of after being imprisoned for over a decade. For more on the Christopher Vaughn case, listen to the podcast “Murder in Illinois” CSI On Trial is a co-production of iHeart Podcasts and School of Humans. It is a Curiosity Podcast based on the Curiosity Stream series CSI On Trial. You can watch all six episodes of the video series here if you sign up for Curiosity Stream.  See omnystudio.com/listener for privacy information.