Some researchers argue that forensic evidence points to more than one shooter.

Some independent experts have challenged the official bullet evidence. For example, researcher Josiah Thompson studied the crime scene photos and medical records. He argues that the way blood and bone scattered shows Kennedy was hit from two different directions. Other scientists have used math and probability to look at the bullet fragments. They argue that the evidence makes the 'one shooter' theory highly unlikely, suggesting at least three bullets were fired by different guns.