CLE Crime Detection and Investigation Review (15% Weight)

CLE Crime Detection and Investigation Review (15% Weight)

Crime Detection and Investigation is the CLE subject covering how criminal cases are actually built — investigation procedure, interview techniques, crime scene processing, and the practical operational side of police work.

For BS Criminology graduates, this overlaps with Criminal Investigation 1 and 2 courses. The 15% weight is lower than the heaviest subjects but still significant — neglecting it risks the 50% subject floor and drops 3-5 weighted-average points needlessly.

This post is the topic-by-topic plan that the CLE 2026 pillar guide hands off to.

What PRC actually asks

Approximate item distribution:

Investigation process and procedures

Drill list:

Investigation phases:

• Initial response
• Preliminary investigation (operational, not the procedural Rule 112)
• Follow-up investigation
• Case closure

Three I's of investigation:

1. Information
2. Interrogation/Interview
3. Instrumentation

5 W + 1 H (questions every investigator asks):

• Who
• What
• Where
• When
• Why
• How

Modus operandi recognition:

• Recurring patterns in suspect behaviour
• Database management for repeat offenders
• Linking cases by MO

Investigator qualifications:

• Knowledge, skills, attitudes
• Observation, memory, recognition

Interview vs interrogation

Interview: information-gathering from cooperating subjects (witnesses, victims, suspects who haven't been arrested).

Interrogation: information-gathering from suspects under custodial conditions, with attendant constitutional rights.

Custodial interrogation rights (Miranda warnings + RA 7438):

• Right to remain silent
• Right to counsel of choice
• Right to be informed in language understood
• Right to be visited by family, doctor, priest, organisation
• Confession must be in writing and signed in counsel's presence

Interview techniques:

• Cognitive interview
• Reid technique (controversial; tested for awareness)
• PEACE model (UK-based, increasing PHL adoption)
• Active listening

Detection of deception:

• Verbal indicators: hesitation, contradictions, vague responses
• Non-verbal indicators: eye contact, posture, micro-expressions
• Limitations and over-reliance risks
• Polygraph (overlap with Criminalistics)

Crime scene processing

Drill list:

Scene response sequence:

1. Receive call → respond
2. Render aid to victims
3. Arrest suspects on-scene if possible
4. Secure the scene
5. Notify investigators
6. Document the scene
7. Process for evidence
8. Release the scene

Documentation methods:

• Notes
• Photography (overlap with Criminalistics)
• Sketches: rough sketch on-scene + finished sketch later
• Video recording

Search patterns:

• Strip / lane
• Spiral (inward or outward)
• Grid
• Quadrant / zone
• Wheel / spoke

Match search pattern to scene type. Indoor/small scenes use spiral or zone; outdoor/large scenes use strip or grid.

Evidence collection:

• Chain of custody (critical for admissibility)
• Packaging by evidence type
• Preservation: refrigeration for biological, dry for trace
• Marking and labelling

Special crime investigations

Drill list:

Homicide investigation:

• First officer responsibilities
• Time of death estimation
• Identification of deceased
• Death notification
• Scene reconstruction

Robbery investigation:

• MO analysis
• Witness interview priority
• CCTV review
• Stolen property recovery

Drug investigation:

• Buy-bust operations (procedure, chain of custody)
• Surveillance
• Test buy
• Controlled delivery
• Section 21 RA 9165 compliance

Sexual assault investigation:

• Trauma-informed approach
• Medical examination procedure
• Evidence collection (rape kit)
• Interview considerations

Cybercrime investigation:

• Digital evidence collection
• Chain of custody for electronic data
• Working with telecommunications providers
• International coordination (Budapest Convention)

Trafficking investigation (RA 9208):

• Victim identification vs perpetrator identification
• Multi-agency coordination
• Cross-border cases

Organised crime and terrorism investigation

• Definitions: organised crime vs terrorism vs ordinary crime
• RA 9372 (Human Security Act, 2007) — repealed
• RA 11479 (Anti-Terrorism Act of 2020) — current
• AMLC and AMLA basics for terrorist financing
• Inter-agency coordination (PNP, NBI, AFP, NICA)

Surveillance and undercover

Surveillance types:

• Stationary
• Moving (foot, vehicle)
• Electronic (with warrant requirements)

Undercover considerations:

• Cover story development
• Backup arrangements
• Entrapment vs instigation distinction (legally critical)

Informant management

• Recruitment (motivation: revenge, money, mercenary, ego, etc. — RUMMICE)
• Handling: cover identity, secure communication
• Compensation considerations
• Reliability assessment

A 4-week Crime Detection drilling plan

Realistic Crime Detection scores

Where Super Tutor fits

Super Tutor's CLE Criminology track covers Crime Detection with item drilling sequenced by topic. Free tier opens investigation process; the Focused plan (₱49/week, ₱249/month, ₱1,999/year) opens special crime investigations + mock cycle.

What to read next

The CLE 2026 pillar guide covers the full review. Other CLE deep dives: Criminal Law, Criminal Jurisprudence, Criminalistics, Correctional Administration.