Christopher D. Duncan retired after 24 years with the Houston Police Department and 5 additional years with the Alexandria (VA) Sheriff's Office. Chris spent nearly 20 years assigned to the Crime Scene Unit and half of that time was spent working the nightshift. Chris has always enjoyed sharing his photographic insights, teaching photography courses around the United States. He has earned recognition by the State of Texas for Professional Achievement and as a Distinguished Member of the International Association for Identification (IAI). Chris earned board certification from the IAI as a Forensic Photographer, Bloodstain Pattern Analyst, and as a Senior Crime Scene Analyst. Chris now is focusing his teaching endeavors on the next generation of crime scene investigators by teaching high school criminal justice students.