Analyzing a crime scene isn't just taking pictures and tagging evidence, but it is a mixture of many different methods to help gather evidence and reveal truths.
This website contains an overview of some popular methods used in crime scenes. The truth is that the analysis of a crime scene does not just take place at the crime scene but at many other different laboratories. Little bits and pieces of evidence are delivered to many different places and are researched by specialists in DNA, fiber analysis,and ballistics.
"Wherever he steps, whatever he touches, whatever he leaves, even unconsciously, will serve as silent witness against him. Not only his fingerprints or his footprints, but his hair, the fibers from his clothing, the glass he breaks, the took mark he leaves, the paint he scratches, the blood or semen he deposits or collects. All of these and more bear mute witness against him. This is evidence that does not forget. It is not confused by the excitement of the moment. It is not absent because human witnesses are, it is factual evidence, physical evidence cannot be wrong, it cannot perjure itself; it cannot be wholly absent, only its interpretation can err. Only human failure to find it, study and understand it, can diminish its value."
-Paul L. Kirk, 1974.
