What is the general procedure of examining a crime scene?

What is the general procedure of examining a crime scene?

At the crime scene we first must isolate it and secure it. We must make sure we don't have people walking around that crime scene, trampling all over it, and inadvertently destroying the evidence. Once that is accomplished, we then can go about to systematically search the scene, search it in a way that we cover the entire scene in a systematic way so that every item of relevance is identified, collected, and preserved. And at the same time, we must document the scene. We must photograph it, we must sketch it, we must have thorough note-taking. Because all of this documentation will come into play when we go to court and the state or the prosecution presents its case to the judge and to the jury. But the important thing to remember is that forensic science begins at the crime scene, and it's all going to be lost if that area of the crime cannot be properly preserved.