Beyond reasonable doubt is what?

The standard of proof required for a criminal conviction

A category of witness statement

The minimum number of witnesses required

Mens rea refers to what?

The mental element of an offence, such as intent or recklessness

The physical act that makes up the offence

Hearsay evidence is what?

A statement made outside court, offered to prove that what it asserts is true

Rumour circulating in the press

Testimony given by an anonymous witness

Research on eyewitness identification has consistently found what?

Confidence and accuracy can come apart, particularly after a witness receives feedback

Witnesses are accurate in almost every case

Only child witnesses make identification errors

Accuracy improves as the delay grows longer

Why is a suspect shown among several similar-looking people rather than alone?

So that a mistaken choice is likely to land on a known-innocent filler and expose the error

To reduce the time an identification takes

Because most jurisdictions require exactly eight people

To conceal the suspect's identity from the witness

A polygraph measures what?

Physiological signs such as breathing, pulse and skin conductance

Electrical activity in the speech centres of the brain

False confessions are most often explained by what?

Prolonged pressure and suggestion, plus a belief that confessing will end the situation

A deliberate wish to protect a friend in nearly every case

Simple confusion about dates and times

Forensic genetic genealogy identifies a suspect by doing what?

Matching scene DNA to distant relatives in consumer ancestry databases and building out a family tree

Sequencing the genome to predict eye and hair colour

Comparing fingerprints across national borders

Testing hair samples for drug traces

Reviews of DNA-based exonerations have most often found which factor in the original conviction?

Mistaken eyewitness identification

Crime & Forensics Hard ⚡ 10 Questions ⏱️ ~8 Mins +100 XP

Identification, Proof and Doubt

Most of the safeguards in a criminal trial exist because a particular kind of error kept happening. Each one has a story behind it.

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About this topic

A criminal trial is not an inquiry into what happened so much as a test of whether a case has been proved to a defined standard. That framing explains a great deal of otherwise puzzling procedure: why the prosecution carries the burden, why an accused person can decline to explain themselves, why a statement made outside court is treated with suspicion when the person who made it cannot be questioned about it. The second half of the subject is empirical rather than legal. Psychologists have spent decades studying how identifications are made, how confidence in them changes after feedback, and how ordinary people can be brought to confess to things they did not do. Much of that research has fed directly back into practice, in the design of lineups and in the requirement to record interviews in full, which is one of the clearer cases of laboratory work changing what happens in a police station.

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Identification, Proof and Doubt: all 10 questions and answers

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1In a criminal trial, the burden of proof normally rests with whom?
- A The defence
- B The trial judge
- C The investigating officers
- D The prosecution Correct
Answer: D. The prosecution

Why: It follows directly from the presumption of innocence. It is also why a defendant can in principle say nothing at all and still be acquitted.
2Beyond reasonable doubt is what?
- A A category of witness statement
- B The minimum number of witnesses required
- C The standard of proof required for a criminal conviction Correct
- D A recognised ground of appeal
Answer: C. The standard of proof required for a criminal conviction

Why: Civil cases in common-law systems use the lower balance of probabilities standard. The same events can therefore produce a civil finding and a criminal acquittal without contradiction.
3Mens rea refers to what?
- A The caution read out on arrest
- B The mental element of an offence, such as intent or recklessness Correct
- C The physical act that makes up the offence
- D A plea based on mental illness
Answer: B. The mental element of an offence, such as intent or recklessness

Why: It pairs with actus reus, the conduct element, and prosecutors generally have to establish both. Strict liability offences are the deliberate exception that dispense with it.
4Hearsay evidence is what?
- A A statement made outside court, offered to prove that what it asserts is true Correct
- B Rumour circulating in the press
- C Testimony given by an anonymous witness
- D Evidence given by a child
Answer: A. A statement made outside court, offered to prove that what it asserts is true

Why: The objection is that the original speaker cannot be cross-examined about it. Most systems then allow a long list of exceptions, such as dying declarations and business records.
5Research on eyewitness identification has consistently found what?
- A Witnesses are accurate in almost every case
- B Only child witnesses make identification errors
- C Accuracy improves as the delay grows longer
- D Confidence and accuracy can come apart, particularly after a witness receives feedback Correct
Answer: D. Confidence and accuracy can come apart, particularly after a witness receives feedback

Why: Telling a witness they picked out the suspect inflates their later certainty considerably. That is why confidence is now recorded at the moment of the first identification, before anyone comments.
6Why is a suspect shown among several similar-looking people rather than alone?
- A Because most jurisdictions require exactly eight people
- B To conceal the suspect's identity from the witness
- C So that a mistaken choice is likely to land on a known-innocent filler and expose the error Correct
- D To reduce the time an identification takes
Answer: C. So that a mistaken choice is likely to land on a known-innocent filler and expose the error

Why: The fillers act as a built-in test of the procedure itself. Warning the witness that the culprit may not be present also cuts false identifications in controlled studies.
7A polygraph measures what?
- A Patterns of eye movement
- B Physiological signs such as breathing, pulse and skin conductance Correct
- C Electrical activity in the speech centres of the brain
- D Changes in voice pitch alone
Answer: B. Physiological signs such as breathing, pulse and skin conductance

Why: No bodily signal is unique to lying, so the instrument records arousal rather than deception. Most courts either exclude the results outright or admit them only where both sides agree.
8False confessions are most often explained by what?
- A Prolonged pressure and suggestion, plus a belief that confessing will end the situation Correct
- B A deliberate wish to protect a friend in nearly every case
- C Simple confusion about dates and times
- D A desire for media attention
Answer: A. Prolonged pressure and suggestion, plus a belief that confessing will end the situation

Why: Recording interviews in full is the standard safeguard. It lets a court see whether a suspect knew details of the offence independently or was supplied with them.
9Forensic genetic genealogy identifies a suspect by doing what?
- A Sequencing the genome to predict eye and hair colour
- B Comparing fingerprints across national borders
- C Testing hair samples for drug traces
- D Matching scene DNA to distant relatives in consumer ancestry databases and building out a family tree Correct
Answer: D. Matching scene DNA to distant relatives in consumer ancestry databases and building out a family tree

Why: The method reached wide attention with the Golden State Killer arrest in 2018. It has since raised persistent questions about the consent of relatives whose data ends up searched.
10Reviews of DNA-based exonerations have most often found which factor in the original conviction?
- A Fingerprint evidence
- B Disputed financial records
- C Mistaken eyewitness identification Correct
- D Forged documents
Answer: C. Mistaken eyewitness identification

Why: Flawed forensic testimony and false confessions appear frequently too, and cases usually involve more than one factor at once. The overlap is part of why single safeguards rarely prevent a wrongful conviction on their own.

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Identification, Proof and Doubt has 10 questions and takes about 8 minutes to finish. It is rated Hard and sits in our Crime & Forensics category.

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Each of the 10 correct answers adds 10 XP, up to 100 XP for a clean run. Wrong answers cost you nothing, and your full question-by-question review is shown at the end.

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Yes. All 10 questions carry a written explanation of why the correct answer is right, so the quiz works as a study sheet as well as a test.

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Yes, as often as you like. The questions and the answer options are reshuffled on each run, and you can use Practice Mistakes afterwards to retry only the ones you missed. No account is needed to play.

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Identification, Proof and Doubt

About this topic

Identification, Proof and Doubt: all 10 questions and answers

1In a criminal trial, the burden of proof normally rests with whom?

2Beyond reasonable doubt is what?

3Mens rea refers to what?

4Hearsay evidence is what?

5Research on eyewitness identification has consistently found what?

6Why is a suspect shown among several similar-looking people rather than alone?

7A polygraph measures what?

8False confessions are most often explained by what?

9Forensic genetic genealogy identifies a suspect by doing what?

10Reviews of DNA-based exonerations have most often found which factor in the original conviction?

Frequently asked questions about Identification, Proof and Doubt

How many questions are in Identification, Proof and Doubt?

How is Identification, Proof and Doubt scored?

Are the answers to Identification, Proof and Doubt explained?

Can I replay Identification, Proof and Doubt?

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