Effective Crime Scene Management and Evidence Preservation
This paper presents a literature review examining the key principles of effective crime scene management. It explores why securing a crime scene is critical for protecting first responders and preventing evidence contamination, identifies multiple ways evidence may be compromised, and outlines methods for documenting and collecting physical, trace, and digital evidence. The paper also explains the concept of chain of custody, underscoring why maintaining an unbroken evidentiary record is essential for prosecution. It further discusses the legal repercussions of failing to protect evidence and examines how forensic investigators distinguish relevant evidence through training, experience, and empirical observation.
- Introduction: Overview of paper's scope and structure
- Why Securing the Crime Scene Matters: Safety and evidence preservation rationale
- How Evidence Can Be Contaminated: Physical, trace, and digital contamination risks
- Documenting and Collecting Evidence: Notebook protocols and collection techniques
- Chain of Custody and Its Importance: Definition, scope, and legal significance
- Differentiating Evidence and Conclusion: Expert judgment and key research findings
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What makes this paper effective
- The paper follows a clear, logically sequenced structure, moving from scene security to contamination risks, documentation, collection, and finally the legal consequences of procedural failures — mirroring the actual workflow of a forensic investigation.
- Direct quotations from authoritative sources (Richards, Gehl, Casey & Burke) are well-integrated and provide specific, concrete detail that supports each claim rather than relying on vague generalizations.
- The conclusion synthesizes key findings concisely, tying the legal stakes (inadmissibility) back to the procedural principles introduced throughout the paper.
Key academic technique demonstrated
The paper demonstrates effective use of a literature review format: each section introduces a distinct topic, deploys a relevant citation or direct quotation to substantiate the point, and transitions logically to the next issue. This technique shows how to organize a review around thematic sub-questions rather than source-by-source summaries.
Structure breakdown
The paper opens with a brief orienting introduction listing the questions it will address. The body is divided into focused sub-sections — scene security, contamination, documentation, collection, chain of custody, and evidence differentiation — each building on the last. A short conclusion recaps the research findings and reinforces the central argument about procedural integrity.
Introduction
The purpose of this paper is to review the relevant literature on the importance of securing crime scenes in order to protect evidence from contamination and preserve it for use by the courts. The discussion addresses different methods for documenting and collecting evidence at a crime scene, explains the chain of custody and why it is important, and examines the repercussions of failing to protect evidence or establish chain of custody. Finally, the paper considers how an investigator or forensic expert differentiates between what is and is not evidence.
Why Securing the Crime Scene Matters
The most important reason for securing a crime scene is to ensure the safety and wellbeing of law enforcement and other first responders. A second critical reason is to prevent the contamination of any evidence that might be available (Almirall, Ballou, Carroll et al., 2013). For example, criminal suspects may still be present and could represent a threat to first responders, or there may be hazardous materials — such as biological, radiological, or chemical threats — that endanger first responders but which must still be preserved as evidence (Almirall et al., 2013).
How Evidence Can Be Contaminated
There are multiple ways that evidence might be contaminated at a crime scene, depending on the type of evidence involved. Emergency medical responders' (EMS') first priority is to protect the medical rights and wellbeing of any injured victims, and evidence may be contaminated in the course of providing emergency medical care (Casey & Burke, 2009). As Casey and Burke (2009) emphasize, "To an EMS provider, all aspects of a crime scene, other than steps to ensure personnel safety, are secondary considerations to treatment of the injured victim" (p. 98). Law enforcement authorities, by contrast, are concerned with safety but are also focused on preserving evidence at the crime scene (Casey & Burke, 2009).
Evidence can also be inadvertently contaminated by even the most conscientious forensic investigators when trace materials such as fibers, hairs, or soil are involved (Richards, 6.1). According to Richards, "Any post-incident contact that transfers hairs and fibers between the victim and suspect will render the evidence useless in court" (6.1). Where digital evidence is involved, contamination risks are equally significant. As Richards notes, "Data, and electronic evidence in general, is fragile. Any use of a digital device has the potential to damage or destroy data. This may be accidental or intentional" (3.1).
References
Almirall, J. R., Ballou, S., Carroll, P. et al. (2013, September). Crime scene investigation: A guide for law enforcement. Largo, FL: National Forensic Science Technology Center.
Casey, J. & Burke, T. (2009, June). Police and EMS. Law & Order, 51(6), 97–101.
Gehl, R. (2019). Crime scene management. Introduction to Criminal Investigations. Retrieved from https://pressbooks.bccampus.ca/criminalinvestigation/chapter/chapter-8-crime-scene-management/.
National Forensic Science Technology Center. (n.d.). Crime scene investigation guide. Retrieved from
Richards, G. E. Chapters 3, 5 and 6.
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