More than one gun. The students must examine a bullet that was found at the scene of the crime to discover more details about the events surrounding the murder. Outside the cabin crime scene, there is evidence of a struggle. A bullet was found lodged in the mud. At a separate crime scene, investigators have found an unloaded gun that was presumed to have been left behind by two of the suspects. Students need to compare bullet striations to see if the bullet found outside the cabin was fired by the gun found by the police.

To do this, students will compare the markings left on bullets to see if the striations will match up. They will analyze physical bullets, as well as microscopic images of the striations. Supplies are included for up to 30 students working in six groups. As in all Lyle and Louise modules, this kit is geared to high school and undergraduate courses and is matched to National Science Education Standards. Kit includes 12 fired bullets (2 bullets per group), 6 photos per group of microscopic bullet striations from the evidence bullets, 6 magnifiers. Also, includes lab questions and data sheets fully illustrated teacher’s manual with technique background. It can be stored at room temperature.