Ethics in Forensic Science: Comprehensive Study Notes

Ethics in Science and Forensic Practice

• Scientists are expected to be unbiased and detached observers who seek to understand the physical world through observation, experimentation, and interpretation. They should not deemphasize or support any one hypothesis while conducting experiments or analyzing results.
• They are expected to impartially evaluate data, revise or abandon a hypothesis based on results, and then pursue new rounds of experimentation and analysis to explore possibilities.
• Forensic scientists are expected to follow the evidence wherever it leads in an investigation, without preconceived or biased notions about outcomes.
• After this chapter, you should be able to:
  • describe what is meant by ethics and how it can guide decisions,
  • discuss conflicts encountered in the practice of forensic science,
  • explain what is meant by a code of ethics for forensic science.

The role of ethics in science and forensic practice

• All scientists are expected to conform to the highest standards and adhere to the scientific method, including experimentation and the concept of fault of liability.
• The possibility that a hypothesis can be shown false by reproducible observation or experiment. In formal terms:
  • a hypothesis H is scientifically meaningful if there exists an observation O such that O contradicts H, i.e. $\exists O: O \models \lnot H.$
• Forensic scientists must both seek evidence that a hypothesis is correct and examine alternative explanations to see if the original idea is incorrect or incomplete.
  • Example: fingerprint comparison should search for similarities and also disclose any differences that suggest non-sourcing from the same source.
• Forensic science must emphasize testing to show that a hypothesis is incorrect as much as to support the theory being tested.
• The ethical standard in science is very high and is a component of philosophy addressing questions of right and wrong. It provides guidance rather than absolute answers.
• Ethics helps keep the justice system fair and accurate and provides a framework for how science informs legal questions.
• Ethics protects the rights of individuals and society in potential conflicts, which frequently arise in court cases.
• There is a substantial literature on ethics in science and forensic science, creating a foundation for addressing these issues. Selection of issues is presented here due to scope constraints.

Codes and guidelines in forensic science

• Several organizations have established ethical guidelines to promote high practice standards.

• The American Academy of Forensic Science (AAFS) is the largest professional organization in forensic science and has established ethical guidelines to promote best practices.

• Other organizations with guidelines include:

  • American Society of Crime Lab Directors (ASCLD),
  • National Association of Medical Examiners (NAME),
  • American Board of Criminalistics (ABC),
  • Society of Forensic Toxicologists (SOFT),
  • and others.

• A representative example: AAFS guidelines require:

  • adhere to the academy’s standards of practice by promoting education and research in forensic sciences,
  • encourage study, improve practice, elevate standards, and advance the field,
  • no forensic scientist shall materially misrepresent education, training, experience, or area of expertise,
  • no forensic scientist shall materially misrepresent data or the scientific principles underlying conclusions.
  • In short, forensic scientists are expected to act ethically and professionally at all times.

• The National Commission on Forensic Science (US DOJ) has established a national code of ethics and professional responsibility for forensic science:

  • accurately represent personal scientific qualifications and avoid potential conflicts of interest,
  • pursue professional competencies through training, proficiency testing, certification, and continuous learning,
  • promote incorporation of new technologies and resist unvalidated methods,
  • maintain integrity, proper handling, safe storage, and analysis of evidence.
  • ensure impartial examination with minimal bias and resist external pressure to deliver a specific outcome,
  • provide true and accurate representations of data and work performed,
  • prepare clear, concise, and complete documentation and communicate honestly,
  • remain impartial during testimony and provide the highest level of scientific analysis within expertise,
  • maintain confidentiality and provide legally acceptable disclosures,
  • report colleagues who act unprofessionally or unethically to the appropriate authority.

• The code of ethics emphasizes that the stakes are very high in forensic science; ethics requires every action to be of the highest standard because flawed handling can destroy lives. Evidence must be collected, stored, analyzed, and interpreted with utmost care.

• Forensic science sits at the interface between science and the legal process, with science and law sharing goals but also having important differences.

Science vs. law: aims and tensions

• Science cannot prove anything beyond simple facts; the law seeks definitive answers to inform timely and just decisions.
• Tools from science (the scientific method, mathematical reasoning) can help reduce conflicts between the needs of science and the demands of legal outcomes.
• An established code of ethics can guide scientists on balancing scientific responsibilities with legal requirements.

The environment and challenges of public forensic science

• Public forensic laboratories often align closely with the prosecution: they may receive samples from police, report results to the district attorney, and appear in court for the prosecution.
• In some cases, crime labs report to and are controlled by law enforcement, including financial control.
• The challenge for forensic scientists is to maintain impartiality while supporting legal practice.
• Bias in forensic science, whether conscious or unconscious, refers to unfair prejudice for or against a person or outcome.

Bias: types and examples

• All people harbor biases; the goal is to minimize personal biases in both scientific and legal work.

• Two broad types of bias in forensic science:

  • Motivational bias: intentional and conscious favoritism toward a particular outcome or person for personal reasons (can constitute a conflict of interest).
  • Example: a lab reporting to the district attorney could be influenced by personal relationships.
  • Cognitive bias: unconscious tendency to see what one expects to see; several subtypes exist:

• Contextual bias (a cognitive bias):

  • Occurs when data being analyzed is embedded with other information not directly related to the data but that could influence thinking.
  • Example: a firearms analyst who also received a fingerprint report tying the suspect to the crime might be more likely to match test-fired bullets to the suspect’s weapon when the fingerprint evidence is present.
  • Studies show examiners recognize potential for contextual bias but deny it affects their work; they are often ineffective at recognizing their own biases.
  • Countermeasures suggested include restricting access to non-essential information during analysis; the President’s Council of Advisors on Science and Technology recommended constraining exposure to extraneous information.

• Expectation bias: the subconscious expectation of a particular outcome before all data are gathered.

• Selection bias: failure to choose a representative sample (e.g., in witness lineups, the choice of lineup members can influence the witness’s decision).

• Conservation bias: an unconscious tendency to interpret data in ways that confirm the examiner’s preexisting beliefs; relates to the human tendency to seek supportive evidence for one’s beliefs.

• Personal confirmation bias of witnesses has been shown to alter both perceptions and memories of events.

• Research and practice focus on identifying and mitigating biases:

  • education on bias,
  • recognizing bias,
  • establishing protocols to limit access to extraneous information during analysis.

Rules of evidence, defense access, and retention challenges

• The rules of evidence require that forensic results and reports be made available to the defense on request (Rule 16).
• How Rule 16 is applied varies: courts have often used it for final reports and conclusions rather than providing access to methods, lab notebooks, comments, or other records created during the investigation.
• The defense typically does not have an automatic right to test or retest the presented evidence.
• Laboratories often lack a legal obligation to permanently preserve records or retain physical evidence for later retesting.

Practical implications for exam preparation

• Ethics and bias are central to ensuring justice in forensic science.
• Always differentiate between what science can prove (claims supported by reproducible data) and what law requires (clear, timely, defensible conclusions).
• Be aware of organizational guidelines and what they require of practitioners (no misrepresentation, impartiality, transparency, and accountability).
• Understand common biases and the recommended strategies to mitigate them (information barriers, education, and standardized procedures).
• Recognize the tension between the investigative process (potentially prosecutorial alignment) and the need for impartial scientific analysis.

Recap: core ideas to remember

• Ethics provide guidance, not absolute answers, and are essential to fairness in justice.
• The scientific method requires that hypotheses be testable and falsifiable, and that evidence be evaluated for both supporting and disconfirming data. In symbols: $\exists O: O \models \lnot H.$
• Forensic science must strive for objectivity, transparency, and accountability in data handling, reporting, and testimony.
• Bias can be motivational or cognitive, with multiple subtypes; robust safeguards include education, procedural controls, and limiting exposure to non-essential information.
• Codes from professional organizations and national commissions define expected conduct, from avoiding misrepresentation to ensuring confidentiality and reporting misconduct.
• The interface of science and law requires balancing the needs for rigorous, evidence-based conclusions with the procedural demands of legal processes.