CSI Legal and Ethical Responsibilities 3 — Questions and Answers
Question 1: When a CSI is processing a scene and finds evidence that may exonerate the current suspect, what is their ethical obligation?
- Ignore it if the lead detective is confident of the suspect's guilt
- Document and preserve it with the same care as incriminating evidence (Correct answer)
- Report it privately to the defense attorney
- Flag it to the prosecutor only
Correct answer: Document and preserve it with the same care as incriminating evidence
Under Brady v. Maryland principles, all material evidence — including exculpatory evidence — must be documented and disclosed.
Question 2: A CSI collects DNA evidence but realizes afterward that the collection kit had expired. What is the correct course of action?
- Submit the evidence and say nothing, hoping lab results are still valid
- Discard the evidence to avoid scrutiny
- Document the issue in the report and notify the supervisor immediately (Correct answer)
- Re-collect the sample without documenting the original collection
Correct answer: Document the issue in the report and notify the supervisor immediately
Documenting errors and notifying supervisors preserves transparency and allows the legal system to appropriately weigh the evidence.
Question 3: What is the purpose of a 'Locard's Exchange Principle' as it relates to a CSI's legal responsibilities?
- It governs how evidence must be photographed
- It establishes that every contact leaves a trace, making contamination a legal concern (Correct answer)
- It defines the chain of custody requirements
- It is a protocol for interviewing witnesses
Correct answer: It establishes that every contact leaves a trace, making contamination a legal concern
Locard's Exchange Principle holds that every contact transfers material, making CSI contamination a legal and evidentiary concern that can invalidate findings.
Question 4: A CSI is asked by a defense attorney at a crime scene to share preliminary findings before a formal report is written. How should the CSI respond?
- Share findings since the defense attorney has a right to the information
- Decline and explain that all findings will be documented in the official report (Correct answer)
- Share findings only if the prosecutor also consents
- Provide a verbal summary but refuse any written communication
Correct answer: Decline and explain that all findings will be documented in the official report
Preliminary findings must go through official documentation channels to protect evidence integrity and prevent misuse of unverified information.
Question 5: Which of the following best describes 'confirmation bias' as an ethical risk in CSI work?
- Favoring evidence that confirms a pre-existing theory while discounting contradictory evidence (Correct answer)
- Confirming the identity of a suspect before collecting evidence
- Requiring multiple confirmatory tests before reporting findings
- Bias introduced by using outdated lab equipment
Correct answer: Favoring evidence that confirms a pre-existing theory while discounting contradictory evidence
Confirmation bias causes investigators to unconsciously favor evidence that supports an existing theory, potentially leading to wrongful convictions.
Question 6: Under what circumstance may a CSI legally enter and process a crime scene without a search warrant?
- When the department chief authorizes it verbally
- When the property owner is not present
- When exigent circumstances exist, such as an ongoing threat to life (Correct answer)
- When more than 48 hours have passed since the crime
Correct answer: When exigent circumstances exist, such as an ongoing threat to life
Exigent circumstances, such as a risk to life or imminent destruction of evidence, are recognized exceptions to the warrant requirement under the Fourth Amendment.
Question 7: A CSI is processing a sexual assault scene. What is the most important ethical consideration beyond technical evidence collection?
- Speed of collection to prevent evidence degradation
- Victim dignity, trauma-informed approach, and strict privacy protection (Correct answer)
- Notifying the press of the assault category for public safety
- Collecting the most evidence possible regardless of victim consent
Correct answer: Victim dignity, trauma-informed approach, and strict privacy protection
Sexual assault victims retain rights to dignity and privacy, and trauma-informed handling is both an ethical and, in many jurisdictions, a legal requirement.
CSI Legal and Ethical Responsibilities 3
When a CSI is processing a scene and finds evidence that may exonerate the current suspect, what is their ethical obligation?