MA State Trooper flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Contrapositive equivalence

The statement "if not Q then not P" is logically equivalent to "if P then Q." The converse, "if Q then P," is not equivalent and often appears as a trap answer.

Necessary versus sufficient condition

A necessary condition must be present for the result to occur; a sufficient condition guarantees the result. "Only if" introduces a necessary condition, while "if" introduces a sufficient one.

Undistributed middle fallacy

An invalid syllogism in which the middle term is never asserted of all its members, such as "all police are trained; all firefighters are trained; therefore all police are firefighters."

Assumption negation test

To test a required assumption, negate the candidate statement. If the argument collapses once the statement is false, that statement was necessary to the reasoning.

Correlation versus causation

Two events occurring together does not prove one causes the other. Reverse causation, a shared underlying cause, or biased selection may explain the observed relationship.

Constraint-first ordering strategy

In scheduling and sequencing puzzles, place the item with the most restrictions first, then propagate forced positions before testing remaining alternatives in a diagram.

Main idea versus supporting detail

The main idea is the central claim the entire passage supports. A supporting detail is true but too narrow to answer a main-point question.

Valid inference standard

A correct inference must be forced by the passage alone. If answering requires outside knowledge, personal opinion, or a guess, the choice is unsupported.

Author purpose and tone

Purpose is what the author intends, such as to advocate, criticize, compare, or explain. Evaluative adjectives and concession clauses signal tone and intent.

EXCEPT and NOT stems

For negative stems, test each option against the passage and eliminate the three choices the passage supports. The remaining unsupported choice is the answer.

Objective report language

Incident reports record observable behavior and direct quotations, such as "slurred speech," rather than conclusions, such as "was intoxicated," which are opinion and weaken credibility.

Report chronology

A narrative report follows time order: date, time, and location; persons involved; observed facts; actions taken; disposition. Past tense and first person are standard.

Plain-language revision

Replace nominalizations with verbs, keep one idea per sentence, and place subject and verb near the front. "Made a determination" becomes "determined."

Transition word logic

Connectors carry argument structure. "However" and "nevertheless" signal contrast, "therefore" signals conclusion, and "subsequently" signals later time order.

Scene priority hierarchy

Immediate threat to life is addressed first, then scene security and evidence preservation, then documentation, notification, and follow-up. Later steps never override life safety.

Force proportionality standard

Force must be objectively reasonable and proportional to the threat, using the lowest effective option. It ends when the threat ends, followed by aid and documentation.

De-escalation communication sequence

Acknowledge the person's concern, state the lawful reason for the action, offer available choices, and give a clear consequence for continued noncompliance.

Mandatory supervisor notification

Typical policy requires notifying a supervisor for force beyond un-resisted handcuffing, any injury, any firearm discharge, and any in-custody death or serious medical event.

Articulable suspicion basis

Decisions must rest on specific observed behavior and stated facts, not on demeanor, dress, race, or neighborhood, which are not lawful bases for stops.

Peer integrity obligation

Minor misconduct by a colleague is addressed directly or reported up the chain. Concealing it converts a minor issue into a serious integrity violation.

Need-to-know information handling

Confidential case information is shared only with those who require it for official duties. Public and media inquiries route to the designated public information officer.

Miles per hour to feet per second

Multiply miles per hour by 1.4667 to obtain feet per second. For example, 60 mph equals 88 feet per second, a standard speed-to-distance conversion.

Total stopping distance formula

Total stopping distance equals reaction distance plus braking distance, where reaction distance is speed in feet per second multiplied by reaction time in seconds.

Percentage change formula

Percentage change equals the new value minus the old value, divided by the old value, times 100. A 20% rise then a 20% fall leaves a net 4% decrease.

Unit cancellation in rate problems

Arrange the calculation so unwanted units divide out. Miles per hour multiplied by hours yields miles, confirming the setup before arithmetic.

Missing value from mean

Total equals the mean multiplied by the count. Subtract the sum of known values from the required total to find the missing value.

Chart baseline distortion

Before comparing bar heights or trend lines, check axis labels, units, and whether the vertical axis starts at zero. A truncated axis exaggerates differences.

Person description sequence

Describe sex, race, age range, height, weight, hair, eyes, facial hair, clothing from top to bottom, scars or tattoos, then direction of travel.

Vehicle recall sequence

Record plate state and characters, color, year range, body style, make and model, then distinguishing damage, stickers, or occupants before direction of travel.

Chunking for retention

Grouping information into short blocks improves short-term memory. A plate is recalled as three-three or two-three-two, and a phone number as three-three-four.

Mental rotation handedness check

When rotating a shape or map mentally, track one landmark through the rotation and verify left-right orientation, since rotation preserves handedness while reflection reverses it.

Eyewitness confidence accuracy limit

Confidence is a weak predictor of eyewitness accuracy. Reliability depends on viewing duration, distance, lighting, stress, and weapon focus during the event.