3.2 Sentence Structure, Syntax, Modifiers, & Active Voice in Official Documentation

Sentence Structure, Syntax, Modifiers, & Active Voice

In law enforcement, how an officer writes is just as important as what an officer writes. A patrol incident narrative is not an informal journal; it is a permanent piece of courtroom evidence. When a defense attorney cross-examines an arresting officer, poorly structured sentences, misplaced modifiers, and ambiguous passive voice become weapons used to create reasonable doubt in the minds of the jury.

NCJOSI² verbal expression items ask you to choose words or phrases that are grammatically correct in a sentence, and the original NCJOSI tests grammar under Grammatical/Written Competency. Recognizing sentence-level errors is the foundation for both. This section details sentence boundary errors, modifier placement, active versus passive voice, and parallel structure in investigative reports.

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Sentence Boundary Faults: Fragments, Run-Ons, and Comma Splices

Every sentence in a police narrative must express a complete, independent thought. Sentence boundary errors break the logical flow of a report, obscure timelines, and can cause critical evidentiary details to be dismissed or misconstrued.

The Anatomy of an Independent Clause

A grammatically complete sentence (an independent clause) requires three essential components:

1. A Subject: The person, agency, or object performing the action or being described ("Officer Vance").
2. A Finite Predicate (Verb): An action or state of being with tense and person ("inspected").
3. A Complete Thought: The clause must be able to stand alone without leaving the reader waiting for an unstated condition.

1. Sentence Fragments

A sentence fragment is an incomplete grammatical structure—often a dependent clause or a participial phrase—punctuated as if it were a full sentence. In police reports, fragments frequently occur when officers record rapid field observations or separate an explanatory phrase from its governing subject.

• Incorrect (Participial Fragment): "Arriving at the convenience store at approximately 0215 hours. Officers noticed shattered glass on the sidewalk."
• Correction: "Arriving at the convenience store at approximately 0215 hours, officers noticed shattered glass on the sidewalk."
• Incorrect (Dependent Clause Fragment): "The suspect fled on foot eastbound down the alleyway. Because Officer Higgins deployed his conducted energy device."
• Correction: "The suspect fled on foot eastbound down the alleyway because Officer Higgins deployed his conducted energy device."

2. Run-On (Fused) Sentences

A run-on sentence occurs when two or more independent clauses are joined together without any intervening punctuation or coordinating conjunction. Fused sentences create severe confusion regarding chronological sequences in pursuit or force narratives.

• Incorrect: "Officer Miller secured the perimeter Sergeant Bradley entered the unlocked residence through the rear patio door."
• Correction: "Officer Miller secured the perimeter, and Sergeant Bradley entered the unlocked residence through the rear patio door." (Or: "Officer Miller secured the perimeter; Sergeant Bradley entered the unlocked residence through the rear patio door.")

3. Comma Splices

A comma splice occurs when two independent clauses are joined with only a comma and no coordinating conjunction. It is one of the most common errors in report writing.

• Incorrect: "The driver failed the standard field sobriety tests, he was placed under arrest for driving under the influence."
• Four Ways to Correct a Comma Splice:
  1. Period + Capital Letter: "The driver failed the standard field sobriety tests. He was placed under arrest for driving under the influence."
  2. Semicolon: "The driver failed the standard field sobriety tests; he was placed under arrest for driving under the influence."
  3. Comma + Coordinating Conjunction (FANBOYS): "The driver failed the standard field sobriety tests, and he was placed under arrest for driving under the influence."
  4. Subordinating Conjunction: "Because the driver failed the standard field sobriety tests, he was placed under arrest for driving under the influence."

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Modifiers: Misplaced, Dangling, and Squinting

A modifier is a word, phrase, or clause that describes, clarifies, or qualifies another element in the sentence. In law enforcement documentation, a modifier must sit as close as possible to the exact noun it describes. When modifiers are positioned incorrectly, they distort facts, alter suspect physical descriptions, or misattribute actions.

1. Misplaced Modifiers

A misplaced modifier is separated from the word it modifies, creating an unintentional, absurd, or legally problematic meaning.

• Flawed Report: "Officer Henderson observed a male subject driving a stolen sedan wearing a red ski mask."
  • Evidentiary Problem: Syntactically, the modifier "wearing a red ski mask" attaches to "stolen sedan," indicating that the car was wearing the ski mask.
  • Corrected Report: "Officer Henderson observed a male subject wearing a red ski mask driving a stolen sedan."
• Flawed Report: "The detective recovered a loaded semi-automatic handgun from the suspect wrapped in a blue bandana."
  • Evidentiary Problem: Was the suspect wrapped in the bandana, or the handgun?
  • Corrected Report: "The detective recovered a loaded semi-automatic handgun wrapped in a blue bandana from the suspect."

2. Dangling Modifiers

A dangling modifier occurs when an introductory modifying phrase (usually an action or condition) does not logically connect to the grammatical subject of the main clause. In police writing, this error often occurs when the officer leaves themselves out of the main clause, making physical evidence appear to act autonomously.

• Flawed Report: "Upon entering the master bedroom, a spent shell casing was located on the nightstand."
  • Evidentiary Problem: The spent shell casing did not enter the master bedroom. The casing cannot perform the action of entering.
  • Corrected Report: "Upon entering the master bedroom, Officer Morales located a spent shell casing on the nightstand."
• Flawed Report: "After conducting a thorough canvass of the neighborhood, no witnesses were located."
  • Evidentiary Problem: The witnesses did not conduct the neighborhood canvass; the investigating officers did.
  • Corrected Report: "After conducting a thorough canvass of the neighborhood, detectives located no witnesses."

3. Squinting Modifiers

A squinting modifier sits between two words or phrases, making it impossible to determine whether it modifies the preceding element or the following element.

• Flawed Report: "Officers who respond to high-speed pursuits frequently suffer administrative reprimands."
  • Ambiguity: Does "frequently" describe how often officers respond to pursuits, or how often they suffer reprimands?
  • Corrected Report (Meaning A): "Officers who frequently respond to high-speed pursuits suffer administrative reprimands."
  • Corrected Report (Meaning B): "Officers who respond to high-speed pursuits suffer frequent administrative reprimands."

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Active Voice vs. Passive Voice in Law Enforcement

The standard for professional law enforcement reporting is active voice. In active voice, the subject of the sentence performs the action. In passive voice, the subject receives the action, and the actual actor is either pushed to the end of a prepositional phrase or omitted entirely.

Why Report-Writing Standards Prefer Active Voice

1. Establishes Clear Accountability: In use-of-force reviews and civil rights litigation, prosecutors and defense attorneys must know precisely which officer performed each physical act.
2. Eliminates Ghost Actions: Passive phrasing like "The taser was discharged and the subject was brought to the floor" conceals who discharged the weapon and who used physical force. Active phrasing like "Officer Reynolds discharged his department-issued taser, and Officer Wu guided the subject to the floor" provides complete transparency.
3. Increases Brevity and Directness: Active voice requires fewer words, eliminates bureaucratic padding, and improves narrative clarity.

Active vs. Passive Transformations

When Passive Voice is Legally Justified

Passive voice is acceptable in police reporting in two limited circumstances:

1. The actor is completely unknown: "The warehouse had been burglarized prior to the business owner's arrival." (The identity of the burglar is unknown).
2. The victim or object is the primary legal focus: "The injured pedestrian was struck by an unidentified hit-and-run motorist." (Emphasizes the victim receiving emergency medical aid).

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Parallel Structure in Investigative Reporting

Parallelism means using the same grammatical pattern to express two or more ideas of equal importance in a sentence or series. Parallel structure is crucial when enumerating an officer's actions, a suspect's offenses, or physical evidence descriptions.

Parallelism in Action Lists

• Faulty (Mismatched Verb Forms): "During the stop, Officer Tanaka checked the driver's license, was inspecting the vehicle registration, and verified insurance."
  • Breakdown: Checked (past tense) + was inspecting (past progressive) + verified (past tense).
• Parallel Correction: "During the stop, Officer Tanaka checked the driver's license, inspected the vehicle registration, and verified insurance." (All three verbs are simple past tense).

Parallelism in Charge Enunciation

• Faulty: "The defendant was charged with reckless driving, carrying a concealed firearm, and to resist arrest without violence."
  • Breakdown: Gerund phrase + gerund phrase + infinitive phrase.
• Parallel Correction: "The defendant was charged with reckless driving, carrying a concealed firearm, and resisting arrest without violence." (All three elements are gerund phrases).

Applying Syntax Checks to Multiple-Choice Items

IOS's verbal expression items ask you to choose the word or phrase that correctly completes a sentence. Practice items in this guide also show four versions of one sentence and ask which is correct, which builds the same error-spotting skill. To identify the grammatically correct version:

1. Eliminate Dangling Modifiers First: Scan the start of each answer choice. If an option opens with an introductory phrase (e.g., "Running through the park...", "Approaching the intersection..."), check who or what comes immediately after the comma. If an inanimate object like "the weapon" or "the squad car" is named, immediately strike that option.
2. Check the Conjunctions Between Main Clauses: When an option contains two complete actions, check whether a comma alone is used. If so, eliminate the comma splice. Look for the version properly utilizing a semicolon or a comma accompanied by and, but, or, yet, so.
3. Verify Active Officer Agency: Between two grammatically sound sentences, choose the active voice construction where the officer or subject takes immediate responsibility for the action rather than the passive construction where actions happen without clear agency.