Grand Island Senior High School - SCIENCE 101 UNIT FIVE: Forensic Science Text Questions Review Questions 1)What is the NIBIN? What is rifling? What two types of markings does this produce? What is a distance determination? How is this done? What is the Greiss Test? When a bullet is retrieved, how is it marked for identification purposes? What should be avoided? Critical Thinking Questions   If you found a firearm at a crime scene, what steps would you take in order to transport the weapon to the lab? Why do you think it might be useful to know the distance between a gun fired and its target? If you were in charge of retrieving bullets at a crime scene, what steps would you take to retrieve a bullet and take it to the crime lab?   What are some of the challenges in analyzing tool marks? Why might it be important for a forensic scientist to determine the distance from a gun to a shooter?