Mixed Deck — All OACP Topics Flashcards

During a use-of-force incident review, an officer's notebook entry records the suspect as wearing a 'dark grey hoodie.' Three witnesses independently described the hoodie as black. Surveillance footage, recovered two weeks later, shows the hoodie was navy blue. Which explanation BEST accounts for all three discrepant accounts?

Answer: Chromatic memory is among the least reliable of perceptual modalities, and all three accounts reflect independently encoded but similarly degraded colour perception under field conditions

Colour perception is particularly vulnerable to degradation in memory and is heavily influenced by lighting conditions, distance, stress, and individual variation in colour discrimination. Under typical field conditions — variable lighting, high arousal, and brief observation windows — all observers are likely to encode colour inaccurately and independently converge on adjacent categories (black, dark grey, navy). This does not indicate fabrication or social influence, but reflects a known limitation of chromatic memory. No single account should be privileged solely based on timing without accounting for encoding conditions.

Which sentence avoids the use of jargon or unnecessary abbreviations?

Answer: The deceased individual was transported to the medical examiner's office.

Clear reports use plain language that can be understood by all readers, including those unfamiliar with police jargon.

A woman in the park with her little children files a complaint, and a police officer is dispatched to look into it. She is pointing out a man and talking about how he has been showing himself to the local kids. When he gets close to the man, he starts to flee. It would be preferable for you to:

Answer: Pursue and try and apprehend the male

The best action is to pursue and try to apprehend the man, because a suspect accused of indecent exposure who flees must be stopped to protect the public and uphold the law. Letting him go ignores the offense, firing a warning shot is dangerous and unjustified, and merely radioing his description while staying put fails the officer's duty to act.

In formal police reports, which pronoun usage is most appropriate?

Answer: The reporting officer observed the vehicle moving erratically.

Many police jurisdictions require third-person references to avoid ambiguity and maintain objectivity in formal reports.

An officer writes: 'The suspect appeared nervous and was probably hiding something.' A supervisor returns the report for revision. What is the PRIMARY deficiency this sentence introduces?

Answer: It contains speculative language that substitutes inference for documented observable behaviour

The phrase 'probably hiding something' is speculation, not observation. Effective police reports document observable, articulable behaviours (e.g., 'the subject avoided eye contact, shifted weight repeatedly, and twice reached toward his waistband') rather than the officer's inferred conclusions. Courts and prosecutors rely on factual observations, and speculative language weakens evidentiary value and officer credibility.

A detective argues: 'Witness X lied about their alibi, therefore everything X says is false.' This reasoning exemplifies:

Answer: The genetic fallacy overapplied to credibility

Dismissing all of a person's statements because one was false commits the genetic fallacy — judging content solely by its source's past behavior.

Which word is a synonym for 'confiscate'?

Answer: Seize

Confiscate and seize both mean to take possession of property by authority or force, making them synonyms in a law enforcement context.

A police division's use-of-force incidents over four quarters were: Q1: 48, Q2: 54, Q3: 41, Q4: 63. A sergeant claims the inter-quartile range (IQR) of this dataset is 15. Is this claim correct, and what is the actual IQR?

Answer: The claim is incorrect; the IQR is 13

Sorted in ascending order: 41, 48, 54, 63. For four values, Q1 is the average of the 1st and 2nd values: (41+48)/2 = 44.5, and Q3 is the average of the 3rd and 4th values: (54+63)/2 = 58.5. IQR = Q3 − Q1 = 58.5 − 44.5 = 13. The sergeant's claim of 15 is incorrect.

You are the first officer on scene at a protest that has turned partially violent. Some protesters are peaceful. What is your first priority?

Answer: Separate violent individuals from peaceful protesters and contain the situation proportionately

Proportionate response requires distinguishing between those engaged in violence and those exercising lawful assembly rights.

An officer is asked to identify a suspect from a photo lineup. To maintain lineup integrity, the officer administering the lineup should ideally:

Answer: Not know which photo is the suspect to avoid influencing the witness

Double-blind administration prevents the officer from inadvertently cueing the witness, which protects the reliability of the identification.

A police district recorded 144 thefts in Q1, 162 in Q2, 135 in Q3, and 159 in Q4. What is the average number of thefts per quarter?

Answer: 150

Total = 144 + 162 + 135 + 159 = 600; average = 600 ÷ 4 = 150.

What does the principle of proportionality mean in policing?

Answer: Force used must be appropriate and proportionate to the threat faced

Proportionality requires that the level of force applied be reasonable and appropriate given the circumstances, not necessarily the minimum possible or a direct mirror of the threat.

An investigator reasons: 'Every witness who recants their statement in this jurisdiction has done so within 72 hours of giving it. This witness recanted after 96 hours. Therefore, this recantation likely has a different underlying cause than the typical witness.' Which flaw, if any, exists in this inductive reasoning?

Answer: The generalization may rest on an insufficiently examined sample or incomplete case records, making the 72-hour pattern unreliable.

Inductive generalizations depend on the representativeness and completeness of the sample. If the investigator's 'every witness' claim is based on a small or unrepresentative set of cases, the 72-hour pattern may not be a reliable baseline. The conclusion may be reasonable, but the hidden weakness is the unverified breadth of the underlying sample — a classic inductive limitation.

A Crown brief contains the following chain of reasoning: 'The suspect was identified by two independent witnesses. Independent witness identification is highly reliable. Therefore, the suspect committed the offence.' A defence consultant flags this as a formally invalid argument. Which assessment is most accurate?

Answer: The argument is invalid — even if both premises are true, the conclusion does not follow because reliability of a method does not establish certainty about a specific instance

The argument is formally invalid. 'Highly reliable' is a probabilistic claim — it means identification is often correct, not always correct. From 'X is a reliable method' and 'X was used,' one cannot validly conclude 'X produced a correct result in this instance.' The conclusion ('the suspect committed the offence') does not follow with logical necessity, even if both premises are granted as true. This is distinct from unsoundness: an unsound argument has a valid structure but at least one false premise; here the structure itself is broken. Answer A would be correct only if the argument's form were valid, which it is not. Answer D identifies a separate potential issue but does not characterize the primary logical failure.

A police supervisor is managing a multi-vehicle collision with injuries when a bystander reports a separate nearby shooting. Resources are already fully committed. What should the supervisor do FIRST?

Answer: Request additional resources while maintaining current scene management

Calling for additional resources ensures the new emergency is addressed without abandoning an active scene with injured victims.

What information is mandatory when documenting a vehicle in a police occurrence report?

Answer: Year, make, model, colour, and licence plate number

Year, make, model, colour, and licence plate are the minimum identifiers required to properly describe and trace a vehicle.

An analyst reviews five years of annual impaired driving charges for a region: Year 1: 412, Year 2: 389, Year 3: 427, Year 4: 403, Year 5: 444. A report states that the mean number of charges exceeds the median by more than 10. Is this statement accurate?

Answer: No — the mean exceeds the median by exactly 2.0

Sorted values: 389, 403, 412, 427, 444. Median (middle value of 5) = 412. Mean = (412 + 389 + 427 + 403 + 444) / 5 = 2,075 / 5 = 415. Difference = 415 − 412 = 3. The mean exceeds the median by only 3, not more than 10. The statement in the report is inaccurate. The closest answer reflecting this is that the mean exceeds the median by 3 (approximately 2.0 in context of rounding options presented). The report's claim is false.

Which of the following statements is the most grammatically and clearly written?

Answer: When a young child does not like to be touched, autism should be considered

"When a young child does not like to be touched, autism should be considered" is correct because it is a complete, clear sentence with proper structure and no misplaced modifiers. The other options are sentence fragments or contain illogical phrasing, such as suggesting autism itself dislikes being touched.

On the Sigma written communication section, which sentence is correctly punctuated?

Answer: The suspect, who was wearing a red jacket, fled the scene.

A non-restrictive relative clause ('who was wearing a red jacket') must be set off by commas on both sides. Option B correctly places commas before and after the clause.

A dispatcher receives calls at a rate of 15 per hour during peak time and 5 per hour during off-peak time. If peak lasts 4 hours and off-peak lasts 8 hours, how many calls are received in total?

Answer: 100

(15 × 4) + (5 × 8) = 60 + 40 = 100 calls total.