Inference Investigators Slides
Confidential Case File CASE #709-INF
Forensic Reading Division
CRIME SCENE INVESTIGATION UNIT
The Case of the
Missing Mascot
Mastering the Science of Inference: How Clues + Schema Crack the Case
Location: Oakridge Middle School • Main Trophy Hall
CLASSIFIED • JUNIOR DETECTIVE ACCESS ONLY
DECODER
What is an Inference?
STEP 01 // FOUNDATION
1. Concrete Clue
Observable facts, physical evidence, or explicit details stated directly in the scene.
"What I actually see/read"
2. Schema (Brain)
Your real-world knowledge, common sense, and personal experience about how things work.
"What I already know is true"
3. Valid Inference
A logical conclusion backed by evidence. It is never a wild guess or random assumption.
"Clue + Schema = Inference"
Golden Rule: An observation is what you notice. An inference is what you figure out based on that evidence.
INCIDENT DISPATCH
07:15 Hours: The Scene Discovered
CASE BRIEFING
Official Custodian Report
At 7:15 AM on Friday morning, Mr. Henderson unlocked the main hallway. The school's prized 50-year-old bronze mascot statue, "Barnaby the Falcon," was missing from the locked glass display case.
• Time of Occurrence: Between 10:00 PM & 6:00 AM
• Glass Case Status: Unharmed (Key lock bypassed)
• Big Rivalry Game: Tonight at 7:00 PM
Investigator Challenge
Oakridge Needs Barnaby Back!
Detectives cannot guess. You must examine every physical clue, connect it to your background schema, and infer who had motive, means, and opportunity.
Let's walk the scene.
INITIAL ASSESSMENT: NO FORCED ENTRY THROUGH FRONT DOORS EVIDENCE TAGS INCOMING →
STATION 1
Physical Evidence at the Case
EVIDENCE LOG #01
EVIDENCE TAG #A
Muddy Waffle-Tread Shoe Prints
Prints enter from the side athletic wing door. Tread pattern matches size 8.5 cross-trainer sneakers.
EVIDENCE TAG #B
Snagged Blue Fleece Fiber
A small thread of electric-blue fleece fabric caught on the display case latch mechanism.
EVIDENCE TAG #C
Faint Scent of Peppermint
A dropped wrapper of strong peppermint chewing gum was found directly beneath the velvet shelf.
EVIDENCE TAG #D
Bent Heavy-Gauge Paperclip
A twisted metal paperclip with scratches on the tip was resting on the marble floor.
DETECTIVE TALK: What does the bent paperclip tell you about how the case opened?
[Clue + Schema]
STATION 2
Timeline & Environmental Data
EVIDENCE LOG #02
22:00
Custodian Locks Main Building
Night custodian secures exterior doors. Weather is clear and dry (62°F).
LOGGED VERIFIED
23:15
Sudden Flash Rainstorm Begins
Torrential downpour creates thick mud around the sports field and bike racks.
WEATHER SERVICE
23:42
Motion Sensor Trigger: Gym Hallway
Sensor #4 records motion for 6 minutes before going completely quiet.
SYSTEM ALERT
Inference Question: Did the intruder arrive before or after 23:15? What clue proves it?
DISCUSS
LINEUP
Persons of Interest Dossiers
4 SUSPECTS
SUSPECT #1
Marcus "Speedy"
Track Captain
- • Shoe: Size 8.5 Spikes
- • Clothing: Black jacket
- • Habit: Chews sour apple
- • Motive: Rivalry prank?
Alibi: Asleep by 10 PM
SUSPECT #2
Chloe Lin
Robotics President
- • Shoe: Size 7 Skate shoes
- • Clothing: Blue fleece vest
- • Habit: Carries paperclips
- • Motive: Needs motor parts?
Alibi: Coding until 1 AM
SUSPECT #3
Oliver Finch
Mascot Performer
- • Shoe: Size 8.5 Waffle cross
- • Clothing: Blue hoodie
- • Habit: Peppermint mints
- • Motive: Loves Barnaby?
Alibi: "Playing video games"
SUSPECT #4
Coach Dawson
Visiting Rival Coach
- • Shoe: Size 11 Boots
- • Clothing: Red windbreaker
- • Habit: Coffee drinker
- • Motive: Psych out team
Alibi: Hotel dinner
Compare the physical clues against each suspect's details. WHO CAN WE ELIMINATE FIRST?
STATION 3
Locker Searches & Statements
TESTIMONY LOG
SEARCH REPORT: LOCKER 114 Oliver Finch
- Damp pair of cross-trainers with mud on soles.
- Blue fleece hoodie with a small tear on the right pocket.
- A tin of strong peppermint breath candies.
- Metal polishing cloth stained with green tarnish.
SEARCH REPORT: LOCKER 88 Chloe Lin
- Completely dry skate sneakers (size 7).
- Blue fleece vest with intact seams (no tears).
- Box of plastic-coated colored paperclips (no plain metal).
- Timestamped commit logs on school server at 23:40.
Notice the metal polishing cloth with green tarnish. What does bronze do over time?
SCHEMA ACTIVATION
HUDDLE
The Detective Deduction Table
GUIDED INFERENCE
CLUE (OBSERVATION)
Muddy tread matches Size 8.5 cross-trainers
SCHEMA (KNOWLEDGE)
Dawson wears size 11; Chloe wears size 7 skate shoes.
LOGICAL INFERENCE
Coach Dawson & Chloe are eliminated.
CLUE (OBSERVATION)
Torn blue fleece fiber + mint wrapper found
SCHEMA (KNOWLEDGE)
Marcus chews sour apple; Oliver eats mints & has torn blue hoodie.
LOGICAL INFERENCE
Physical evidence points directly to Oliver.
CLUE (OBSERVATION)
Metal polish with green bronze tarnish
SCHEMA (KNOWLEDGE)
Thieves sell or destroy items; polish is for cleaning & caring.
LOGICAL INFERENCE
The motive was not theft—it was maintenance!
Look at Row 3: How does schema change our understanding of Oliver's motive? READY FOR THE REVEAL?
SOLVED
Case Closed: The Truth Revealed
CONFESSION LOGGED
CULPRIT: OLIVER FINCH (MASCOT PERFORMER)
It Wasn't a Sabotage—It Was an Emergency Polish!
Oliver sneaked into school at 23:42 during the rainstorm using his gym pass. He picked the lock with a paperclip to borrow Barnaby overnight because the bronze statue had turned dull and tarnished before the big pep rally.
He spent all night polishing the falcon to a mirror shine in his garage. He panicked this morning when he saw police tape, but returned Barnaby safely at 08:30 AM!
DEDUCTION BREAKDOWN
Culprit Identity: Oliver Finch
Key Physical Clues: Fleece fiber, mint, shoe size
Schema That Cracked It: Polishing cloth = care, not theft
NO EXPULSION ISSUED • COMMENDED FOR SPIRIT (AND GIVEN DETENTION FOR LOCKPICKING) JUSTICE SERVED ✓
TAKEAWAYS
The Detective's Inference Rulebook
SUMMARY
RULE #1
Anchor to Evidence
Never make a claim you cannot point to in the scene or text. Every inference must have a physical anchor.
"Show me where it says that."
RULE #2
Activate Your Schema
Authors and scenes leave gaps on purpose. Use what you already know about human behavior and science to bridge the gap.
"What makes logical sense?"
RULE #3
Reject Wild Guesses
If other clues contradict your theory, abandon the theory. Good detectives follow the clues wherever they lead.
"Follow facts, not feelings."
INVESTIGATION COMPLETE: You are officially certified Forensic Inference Readers.
CASE #709 CLOSED
