Forensic Science: Methods, Reliability, and the CSI Effect
This paper examines the development of forensic science from the 18th century to the present, with a focus on the scientific methods used for evidence collection and analysis. It addresses ongoing concerns about the reliability and validity of forensic methods, the role of peer review in establishing scientific credibility, and how public perceptions — shaped by media and fiction — affect juror decision-making. The paper also evaluates the so-called "CSI effect" and its real or perceived influence on criminal trials. Finally, it considers the dangers posed by junk science in forensic practice and argues that stronger standards and improved scientific literacy are essential to the integrity of the criminal justice system.
- Introduction: Historical roots and current challenges of forensic science
- Scientific Methods in Forensic Science: Varied methods and the struggle for validated standards
- Peer Review in Forensic Science: Limits and types of forensic peer review processes
- Common Perceptions of Forensic Science: Media and science literacy shape public understanding
- The CSI Effect: TV crime drama distorts juror expectations of forensic evidence
- Junk Science in Forensics: Pseudoscientific methods have undermined criminal justice outcomes
- Conclusion: Call for stricter standards and improved scientific literacy
✍️ How to write this paper — guide, tools & examples ▾
What makes this paper effective
- The paper maintains a clear and logical structure, moving from the historical evolution of forensic science to specific modern challenges such as the CSI effect and junk science, creating a coherent argumentative arc.
- It draws on multiple credible academic sources — including peer-reviewed journals and government publications — to support each claim, lending the paper scholarly authority.
- The paper connects scientific concerns (reliability, validity, peer review quality) to real-world consequences (false acquittals, wrongful convictions), making the stakes of the argument concrete and compelling.
Key academic technique demonstrated
The paper effectively uses synthesis across multiple sources to build its argument. Rather than treating each source in isolation, the writer integrates perspectives from Bell et al. (2018), Ballantyne et al. (2017), and Shelton (2008) to show both the consensus and the tensions within the literature — for example, acknowledging that survey data on the CSI effect is less alarming than commonly assumed, while still affirming the broader problem of scientific illiteracy in the criminal justice system.
Structure breakdown
The paper opens with a historical and conceptual introduction, then dedicates individual sections to scientific methods, peer review, public perception, the CSI effect, and junk science, before closing with a brief policy-oriented conclusion. Each section addresses a distinct but related dimension of the central problem: the gap between how forensic science is practiced and how it is understood by non-scientists.
Introduction
Forensic science evolved as an attempt to introduce scientific methods into criminal justice. From the 18th century onward, advancements in chemistry, biology, and physics paved the way for forensic science (Gaensslen & Larsen, 2019). Likewise, the routine use of autopsy and forensic pathology helped improve the ability to understand the causes of death (Gaensslen & Larsen, 2019). Forensic science steadily evolved in conjunction with advancements in scientific instruments and the methods used for data collection and analysis. DNA evidence and analysis have made a huge impact on the field. Current concerns in forensic science include the need for increased reliability and validity of forensic methods, as well as public perceptions of forensic science. Because those perceptions could have a direct impact on juror decisions, distinguishing real science from junk science becomes one of the most important issues in criminal justice.
Scientific Methods in Forensic Science
Forensic scientific methods are varied and complex, "ranging from DNA analysis to chemical composition to pattern recognition" (Bell, Sah, Albright, et al., 2018, p. 4541). Big data has also contributed tremendously to the collation and methods used in forensic analysis. Interestingly, the methods that had been used in forensic science until relatively recently had yet to be vetted by the scientific community. Instead, the standards of validity and reliability were established by members of the legal and criminal justice systems (Bell, Sah, Albright, et al., 2018). Ongoing investigations critiquing these methods led to the dismantling of the National Commission for Forensic Science (NCFS), but unfortunately no replacement system was established to set standards for reliability and validity (Bell, Sah, Albright, et al., 2018). Kaplan & Puracal (2018) advocate for a "collaborative approach" to increase validity and reliability (p. 1).
Peer Review in Forensic Science
Peer review has long been considered a gold standard for establishing scientific credibility, authenticity, and legitimacy. Yet as Ballantyne, Edmond, & Found (2017) found, after an assessment of peer review processes in forensic science, "its actual value in most forensic science settings has yet to be determined" (p. 66). Peer review processes are only as valid and reliable as their structure and design. There are different types of peer review, including editorial peer review, peer review by the scientific community, technical and administrative review, and verification (Ballantyne, Edmond & Found, 2017). Which type of peer review process is used matters, and it affects the value of expert witness testimony as well.
Common Perceptions of Forensic Science
The public's perception of forensic science depends on multiple factors, including media literacy, science literacy, and the influence of several generations' worth of both fiction and true crime stories. Media literacy refers to the public's ability to discern the credibility of a news source or any other source of information, whether print or digital. Science literacy refers to the public's understanding of the scientific method and the ability to think critically about the validity and reliability of scientific studies. This includes an understanding of the peer review process and how to distinguish an actual scientific journal from one that merely uses technical jargon while masquerading as science.
One of the strongest influences on the common perception of forensic science comes from the worlds of fiction and non-fiction. Crimes have always been a part of the human experience, resulting in countless accounts of both true and fictionalized methods used to solve them. From the Enlightenment onward, scientific methods became incorporated into the processes of gathering data and assessing evidence in order to solve crimes and bring about justice. Both fiction and non-fiction accounts of forensic science have shaped public perceptions of the validity and reliability of forensic evidence. The romance of crime and crime-solving has resulted in a proliferation of true crime and fiction television and film — including the CSI series — producing what is known as the "CSI effect."
Conclusion
The future of forensic science depends on the establishment of stricter standards and a commitment to scientific literacy within the criminal justice community. Whether or not the CSI effect is real, forensic science needs to address its own shortcomings by promoting the means by which media and scientific literacy can be improved. The use of forensic science should be strictly guided by a commitment to justice.
References
Ballantyne, K. N., Edmond, G., & Found, B. (2017). Peer review in forensic science. Forensic Science International, 277, 66–76. https://doi.org/10.1016/j.forsciint.2017.05.020
Bell, S., Sah, S., Albright, T. D., Gates, S. J., Jr., Denton, M. B., & Casadevall, A. (2018). A call for more science in forensic science. Proceedings of the National Academy of Sciences of the United States of America, 115(18), 4541–4544.
Gaensslen, R. E., & Larsen, K. (2019). Introductory forensic science (2nd ed.). Retrieved from http://content.ashford.edu/
Kaplan, A. B., & Puracal, J. C. (2018). It's not a match: Why the law can't let go of junk science. Albany Law Review, 81(3), 895–939. Retrieved from
National Research Council. (2009). Strengthening forensic science in the United States: A path forward. The National Academies Press. https://doi.org/10.17226/12589
Redmayne, M., Roberts, P., Aitken, C., & Jackson, G. (2011). Forensic science evidence in question. Criminal Law Review, 5, 347–356. Retrieved from
Shelton, D. E. (2008, March). The 'CSI effect': Does it really exist? NIJ Journal, 259. Retrieved from https://www.nij.gov/journals/259/pages/csi-effect.aspx
Create your account
Always verify citation format against your institution’s current style guide requirements.