What type of physical evidence does an investigator look for at a crime scene?

What type of physical evidence does an investigator look for at a crime scene?

Richard Saferstein (Former Chief Forensic Scientist) gives expert video advice on: What is the general procedure of examining a crime scene?; How do police isolate and secure a crime scene?; How does an investigator perform a search at a crime scene? and more...

There are certain items that we see on a repeated basis at crime scenes, such as hairs, fibers, paint chips, glass, guns, bullets, cartridges, and different types of ropes. Also, what's interesting and very important are these carriers of physical evidence - things that we see at scenes that somebody may have touched with their lips or their fingers and have deposited a finger print or DNA onto. We're not going to know much about that until we get it back to the crime lab and we have it analyzed.