What does a Crime Scene Investigator do?

In a nutshell, a CSI will handle more complex crime scenes, such as homicides, sexual offenses, and robberies. They will evaluate the crime scene using advanced equipment and techniques. In processing crime scenes, a CSI will be responsible for collecting, handling, and packaging evidence. A CSI will also have the responsibility for photographing the crime scene (or evidence at the crime scene) whenever necessary.

How much money do CSI's make a year?
How can I find out about the specific job description and salary of a CSI in my area?