What physical evidence is important for an investigator to collect at a crime scene?

What physical evidence is important for an investigator to collect at a crime scene?

That's an interesting question. Obviously, that depends on the crime scene. I mean, you come to a scene, there may be a gun, there may be a bullet, and there may be a knife. Those are the obvious things that you will go for. Then there are the less obvious things, the things that are hidden from sight and you get them by conducting a systematic search. You know, looking very carefully at the scene, looking for things that aren't very obvious. But you know what? There are also things that you can never find at the crime scene. We call them "carriers" of physical evidence. There's perhaps a glass that the lips of the perpetrator touched and as a result, left his or her DNA on. Or, a cigarette butt where a person's DNA may have been deposited. There are objects that have possibly fingerprints on them. They have to be brought back to the laboratory. So we call these items "carriers". We may not know that they're appropriate until we bring them back to the lab and we look at them. So they have to be collected in a very thorough fashion as well.