Forensic Evidence

This chapter examines the role of forensic evidence as an element in crime pattern identification. Forensic evidence, ranging from fingerprints and DNA to digital traces such as cell phone records, GPS data, and surveillance footage, provides scientifically verifiable links between offenders and offenses. When available, it establishes objective connections across cases; when absent, it underscores the importance of modus operandi (MO) information for identifying and linking related crimes. Drawing on crime-specific examples, the chapter demonstrates how forensic evidence contributes to solving homicides, sexual assaults, arsons, burglaries, cybercrimes, and other offenses. A case study of serial arsonist Thomas Sweatt illustrates the integration of DNA and MO details in offender identification. The chapter emphasizes that forensic evidence must be interpreted in concert with behavioral and situational variables, reinforcing its role as one part of a larger diagnostic system in crime pattern identification.