Chapter 38 — Exercises

Work these without looking back at the chapter first; then check yourself. Items marked † have full worked solutions in the answers appendix. There are no answers in this file. Mix of recall, applied reasoning, evidence interpretation, "spot the overstatement," ethics dilemmas, and a cold-case extension. This is the book's reform chapter — several items ask you to assemble the four themes into an argument.

A. Recall and definitions

  1. Define forensic ethics in one sentence, and name three of the specific, recurring tensions built into the job that it exists to resolve.

  2. † Define a code of ethics and explain precisely what the phrase "necessary but not sufficient" means when applied to it. Why can a code do little to produce honesty in a system structured to discourage it?

  3. State the five core principles common to forensic codes of ethics, and match each principle to a technical theme taught earlier in the book.

  4. Define the lab independence problem in one sentence. What does it mean to say most American crime labs are "embedded"?

  5. Define conflict of interest, and explain why the key word in the definition is risk rather than corruption.

  6. † What is OSAC? State what it does, who administers it, and the single most important thing it cannot do.

  7. Define forensic reform as the chapter uses it, and name the two landmark reports whose agendas it collects.

  8. Distinguish structural bias from individual corruption. Why is structural bias, in the chapter's view, harder to fix than corruption?

B. The independence problem

  1. † List the four mechanisms by which an embedded laboratory's structure tilts toward the prosecution (the analyst receiving context; the detective as colleague; success defined by the prosecution's success; the funded pressure). For each, name the specific safeguard the chapter offers.

  2. Re-read Figure 38.1 (the dependent vs. independent lab models). State the single most important difference in what information reaches the analyst between model (A) and model (B), and why that difference matters more than budget separation alone.

  3. Explain how the independence problem is "Theme 3 scaled up from the individual to the institution." Why does the chapter insist the individual-level fix (context management) and the structural fix (independence) are "two halves of one reform"?

  4. The chapter argues the independence problem is the strongest argument for the Melendez-Diaz right to confront the analyst (Chapter 5). Reconstruct that argument in three sentences.

  5. † Give the four reasons the chapter offers for why lab independence — the NAS report's deepest recommendation — remains the least adopted. Which of the four is, in your judgment, the hardest to overcome, and why?

C. The reforms and their (non-)implementation

  1. List the 2009 NAS report's seven recommendations (as the chapter distills them). Then mark each as, today, largely done, partial, or largely not done.

  2. † The chapter claims a clear pattern in which reforms advanced and which did not. State the pattern in one sentence, and explain why it is "exactly the pattern you would expect if the obstacle were not ignorance but interest."

  3. PCAST 2016 said an examiner from a foundationally valid discipline may testify to a match under exactly one condition. State the condition and explain why it follows directly from the concept of foundational validity (Chapter 6).

  4. What was the National Commission on Forensic Science, and what happened to it? What does its fate illustrate about the "national governing body" the NAS report asked for?

  5. The chapter calls the Department of Justice's response to PCAST "the independence problem operating at the highest level." Explain what is meant, identifying the institutional conflict of interest at work.

D. OSAC and the standards movement

  1. Explain the difference between a sound standard for performing a comparison and evidence that the comparison's central claim is valid. Use bite-mark analysis (Chapter 16) to make the distinction concrete.

  2. † Why does the chapter treat OSAC as both genuine progress and a "perfect emblem" of the chapter's thesis? Resolve the apparent tension.

  3. A laboratory follows an OSAC-registered standard, with full documentation and passing proficiency tests, for a method that lacks foundational validity. Spot the overstatement in this claim: "Our results are reliable — we follow the published national standard." What is true, and what is being smuggled in?

E. Conflicts of interest and the adversarial system

  1. Name and briefly describe the three characteristic forms of conflict of interest in forensic science (the embedded analyst, the hired expert, the institution). Give the safeguard for each.

  2. † Explain why conflicts of interest are especially dangerous in forensic interpretation specifically. Why would the same conflict be harmless in a purely mechanical measurement task? Use the phrase "interpretive judgment under ambiguity."

  3. The chapter says the adversarial system is "double-edged" — both part of the problem and one of the few working remedies. Give one way it is the problem and one way it is the remedy.

  4. Reconstruct the chapter's distinction between non-adversarial science and the adversarial legal system, and explain what is meant by "the adversarial system reaching back into the laboratory and bending the science before it ever reaches the courtroom."

F. Spot the overstatement / junk-science alert

  1. † A laboratory director testifies: "Our lab is fully accredited and our analysts follow national standards, so our results can be relied upon." Identify two distinct things this statement conflates or overstates, drawing on Chapter 4 and §38.4. Rewrite it as an honest statement.

  2. An examiner from a discipline that PCAST found lacks established foundational validity testifies that their conclusion is held "to a reasonable degree of scientific certainty." Name the overstatement and state what PCAST said such testimony should instead do (or whether it should be admitted at all).

  3. A prosecutor argues: "The defense's complaints about lab independence are an insult to hard-working analysts who would never falsify a result." Explain why this response misunderstands the independence argument, using the structural-bias-vs-corruption distinction.

G. Ethics and reasoning

  1. † You are a newly hired analyst in an embedded county lab. You cannot make the lab independent. List five reforms from §38.6 that you can practice personally, today, regardless of who signs your paycheck — and for each, name the theme or earlier chapter it enacts.

  2. An analyst discovers a result that contradicts the prosecution's theory in a case where a colleague-detective is certain of the suspect's guilt. Using the codes of ethics (§38.1), state the analyst's obligation and the specific principle that governs it. What makes this hard in an embedded lab?

  3. The chapter says juries are "part of the structure that determines whether forensic science tells the truth." Explain the mechanism (tie it to the CSI effect, Theme 4) by which a more sophisticated jury changes the incentives "all the way back down the chain" to the bench.

  4. † Is it ethical for a competent expert to accept payment from one side in a case? Distinguish the acceptance of payment from the hired-gun problem (Chapter 30, §38.5). What practices keep the former from becoming the latter?

H. Synthesis and validity spectrum

  1. † Run a forensic result of your choice (real or hypothetical) through the five-question reform checklist of Figure 38.2. State, at each node, what would have to be true to pass, and identify which node a bite-mark "match" fails and which node an overstated DNA result fails. Explain why the two fail at different nodes.

  2. Explain how all four of the book's themes "culminate here as one program." Name each theme and state the specific reform it becomes in this chapter.

  3. Validity-spectrum question. Place these on the validity spectrum and state, for each, the highest-confidence reform-checklist node it can pass and the node it fails: single-source DNA reported honestly; latent-print comparison testified to as "zero error rate"; firearms/toolmark "identification"; bite-mark comparison. Justify with the NAS/PCAST framework.

I. Cold-case extension

  1. † Cold Case. The Mill Creek case was worked by a small, non-independent county lab under an early "accidental fire" frame and, later, a confession. Write the entry you would add to the case file's Process Critique page (Appendix I). State (a) the structural problem present, (b) the two or three specific reforms that would have produced a cleaner result, (c) the honest status after this chapter, and (d) why "process critique completed" is not the same as changing the conclusion about who is responsible.

  2. Cold Case extension. Take one specific piece of the cold-case evidence — the heat-degraded DNA mixture (Chapters 8–9), the arson origin-and-cause determination (Chapter 22), or the soil/pollen association (Chapters 13, 24). Explain concretely how (i) lab independence, (ii) context management / sequential unmasking, and (iii) blind verification would each have strengthened that specific finding, and what an opposing expert could currently argue in their absence.

  3. Cold Case, integrative. The chapter says the case "appears to have reached a sound result despite its process, not because of it." Explain why a justice system "cannot rely on getting the right answer through a flawed process," using the near-miss with Cody Renner (Chapters 6, 33, 34) as your evidence. What does reform "buy," if not a different answer?

J. Short writing

  1. In 150–200 words, explain to a skeptical police chief why making the crime lab independent of the department would improve the reliability of the evidence the department relies on — not weaken the department. Anticipate and answer the objection that independence means "losing control of our lab."

  2. † In 150–200 words, write the closing argument of this book: why the crisis in forensic science is "no longer primarily a scientific problem" but "an ethical and structural one," and why that diagnosis is, in the end, a reason for hope rather than despair. Use the distinction between the reforms that require institutional will and the ones available to any individual practitioner.