Sgt James Hager of the Monroe County Sheriff's Office talks about the challenges of processing a crime scene under water and how procedures for handling violent crimes at sea differ from handling them on land.

Forensics has revolutionized law enforcement in the last several decades. We talk to the experts to see how these advancements have helped to close tough cases.

We ask retired CSI detective Ken Martin about the legitimacy of TV cops digging bullets out of walls, tying red strings through a scene, and other forensic techniques to learn which are real and which are just for the camera.

In the second part of a three-part series on crime-scene investigating, retired CSI Ken Martin breaks down what happens once law-enforcement teams arrive and some of the challenges he's faced in gathering evidence.

Ken Martin, a veteran crime scene investigator, describes problems that arise when gathering evidence, and how to avoid having defense attorneys claim contamination.

Michael J. Tillman says 20 years in the crime-scene cleanup field have taught him how to walk the line between sensitive, personal care for a victim's family and maintaining a sense of remove so he can still come to work the next day.

In a Q&A, Alexis Robie, Executive Producer of The First 48, reveals what he's learned over the course of 14 years of making the show–which includes 584 cases, and 859 arrests–including the worst crime he ever covered.