1.Arson is a specialized area that may be handled by various organizations. However, police crime scene units are commonly involved. What are the issues that fire investigators have to deal with both in the field and in Court?
2. What can be learned from hair evidence other than DNA?
3. Discuss the trace evidence in the investigation in the death of DEA agent Enrique Camarena.
4.Watch the You tube video in this module and describe the different types of trace evidence found.
https://youtu.be/U18y8BM3Vho
Sample Answer
The investigation of arson, hair, and trace evidence requires a unique blend of chemical analysis and meticulous scene reconstruction. Below is an overview of the challenges and historical applications of these forensic disciplines.
1. Challenges in Arson Investigation
Arson is one of the most difficult crimes to investigate because the very nature of the crime—fire—is designed to destroy the evidence.
Field Issues:
Destruction of Evidence: Accelerants (like gasoline) often evaporate or are consumed by the fire. Furthermore, the high-pressure water hoses used by firefighters can wash away or contaminate trace evidence and char patterns.
Structural Instability: Investigators must often work in "overhaul" conditions where the ceiling or floors are compromised, limiting the time available to process the scene.
Determining the Origin: Distinguishing between an accidental electrical fire and an intentional incendiary fire requires identifying the "V-pattern" or "pour patterns," which can be masked by secondary ignitions.