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? what is the doppler effect? how can the doppler effect be useful for a forensic investigation involving a shooting?