A criminal case detective should first use the evidence available in a scene, such as residual elements from a gunshot, fingerprints, or clothing, in order to identify what happened. Any material found helps the detective figure out what type of crime happened. For example, if I enter a murder scene and find clothes stained in blood and a person with a mark in his neck, I will have to figure out is someone commited the crime of if it was self inflicted. I will recur to witnesses who will help me gather clues to reconstruct the scene. The goal is that the crime will stand in court, where a suspect will be apprehended and different witnesses will attest to the crime committed.
