7.2 Field Interviews & Investigative Stops

The Encounter Continuum Every Missouri Officer Must Articulate

Quick Answer: Not every police contact is a seizure. A consensual encounter allows a person to walk away. A Terry stop is a brief investigative detention based on reasonable suspicion that crime is afoot. An arrest requires probable cause. A frisk is a separate weapons check when you reasonably believe the person is armed and dangerous—it is not a free search for drugs or evidence.

This section applies Fourth Amendment concepts (Chapters 2–3) to street patrol. Academy Technical Studies and legal blocks both test whether you can name the level of contact and the facts that justify each step. The MPOLE rewards precise articulation; it punishes “I just had a feeling.”

Consensual Encounter vs Terry Stop vs Arrest

Consensual encounters

You may approach a person in a public place and ask questions. The encounter stays consensual when a reasonable person would feel free to decline and leave. Tone, number of officers, blocking exits, holding ID without return, and commanding language can convert a chat into a seizure.

Missouri street example: You walk up to someone outside a convenience store on Natural Bridge in St. Louis and say, “Hey, got a minute? We’re checking on a nearby break-in—did you see anything?” If they say no and walk away, and you do not restrain them, the contact was consensual.

Terry stops (Terry v. Ohio)

A Terry stop is a temporary seizure based on reasonable suspicion—specific, articulable facts that, taken together with rational inferences, suggest criminal activity is occurring, has just occurred, or is about to occur. Duration must be reasonably related to the investigation; you may not turn a brief stop into a de facto arrest without probable cause.

Arrest

Probable cause is a higher standard: facts sufficient for a reasonable officer to believe the person committed an offense. Arrests trigger Miranda concerns for custodial interrogation, search-incident-to-arrest rules, and transport/custody duties (see §7.4).

Exam trap: Handcuffing, pointing firearms, or long detention in a patrol car can push a “Terry stop” into arrest territory depending on totality of circumstances. Force and restraint level must match the justification.

Reasonable Suspicion Articulation

Reasonable suspicion is not probable cause and not a hunch. Train yourself to write facts a supervisor or judge can evaluate:

Strong articulation ingredients

• Time, location, and crime patterns (e.g., series of catalytic converter thefts in that lot after 0100)
• Matching description to a recent BOLO (clothing, height, vehicle, unique marks)
• Observed behavior linked to crime (casing storefronts, looking into car windows with tools at 0200, flight plus other facts)
• Officer training and experience applied to specific observations (not stereotypes)
• Evasion that is more than mere refusal to talk in a consensual setting—e.g., unprovoked flight in a high-crime area combined with other factors under case-law teachings

Weak / failing articulation

• “Looked nervous” alone
• “High-crime area” alone
• Race, age, or clothing style as the only basis
• “Known troublemaker” without current facts
• Stacking conclusions (“acting shady”) without describing actions

Field interviews (FI) and documentation

A field interview is an information-gathering contact—often during a consensual encounter or Terry stop—used to identify persons, vehicles, associates, and circumstances for intelligence and future investigations.

FI card / report content (awareness level):

• Date, time, precise location
• Subject identifiers (name, DOB, address, physical description)
• Vehicle info if any
• Reason for contact (facts, not slogans)
• Statements, associates, direction of travel
• Disposition (warned, released, arrested, referred)

Good FI documentation:

1. Supports intelligence (repeat sightings at burglary times).
2. Defends the stop if later challenged.
3. Helps other officers recognize patterns across shifts and agencies.

Missouri practice note: Agencies differ on electronic vs paper FI systems; the exam cares that you document specific facts and the legal basis for any detention.

Terry Frisk: Weapons Only, Separate Justification

A stop and a frisk are two different legal steps.

You may stop someone without frisking them. You may not frisk merely because the stop is lawful. Armed-and-dangerous facts include a visible bulge consistent with a weapon, reliable tip of a weapon plus corroboration, violent crime context (e.g., just-armed robbery suspect), furtive movements toward a waistband under the totality, or other specific facts taught in academy case examples.

During the frisk:

• Pat outer clothing for weapons.
• If you feel an object that is immediately apparent as a weapon (or, under plain-feel doctrine teachings, immediately apparent contraband without further manipulation), seizure rules may apply—do not squeeze and manipulate soft packages to “investigate” contents beyond plain feel.
• Opening containers, digging pockets for evidence, or emptying bags is generally beyond a pure Terry frisk unless another doctrine applies (consent, PC, arrest + SIA, etc.).

Exam trap: Lawful stop → automatic full search of pockets for drugs. Wrong. Frisk = weapons; evidence search needs its own authority.

Gang / Intelligence Awareness Without Profiling

Missouri officers legitimately track gang sets, monikers, colors used as one factor among many, graffiti patterns, and associate networks when tied to criminal activity. Intelligence-led policing reduces violence when it is behavior- and crime-based.

Professional / lawful limits:

• Do not stop someone solely because of race, ethnicity, national origin, or religion.
• Clothing or neighborhood may be one contextual fact; it cannot be the entire case for a seizure.
• Document criminal predicates: trespassing after warning, drug transactions observed, weapons, valid warrants, traffic violations, matching suspect descriptions.
• Treat juveniles and status issues carefully (juvenile chapter); FI contacts with minors often require additional policy steps for notification and custody.

MPOLE framing: Intelligence awareness + constitutional restraint is the correct pair. “Profiling” as a substitute for facts is both unlawful and a test failure.

Missouri Street Scenarios (MPOLE Style)

Scenario A — Consensual stays consensual
You ask a pedestrian near a Columbia bar district if they saw a fight. They answer briefly and leave. No seizure occurred if a reasonable person would feel free to go.

Scenario B — Terry stop justified
At 0215 near repeated auto break-ins in a Independence shopping center, you see a person trying door handles on multiple cars with a backpack and flashlight. You have RS for attempted tampering/theft-related activity; a brief stop to investigate is supported. Frisk only if armed-and-dangerous facts develop.

Scenario C — Arrest level
You develop PC that the same person just shattered a window and removed property (eyewitness + matching description + property in hand). Arrest authority and search-incident rules apply—not merely a casual FI.

Scenario D — Frisk boundary
During a valid stop for a just-occurred strong-arm robbery, the suspect matches clothing and direction of flight and keeps blading a waistband. RS armed-and-dangerous supports a weapons frisk. Finding a hard object consistent with a weapon allows seizure of that object; rummaging for general evidence exceeds the frisk.

Articulation checklist before you write the report

1. What specific facts did I observe or reliably learn?
2. What crime did those facts suggest?
3. Was the person free to leave? If not, why (RS or PC)?
4. Did I frisk? If yes, what armed-and-dangerous facts?
5. Did any search exceed weapons scope without new authority?

Mastering this checklist is how patrol officers turn academy legal hours into defensible street work—and how candidates convert scenario stems into correct MPOLE answers.