Midnight Heist Investigation Worksheet
CONFIDENTIAL // CLASSIFIED DOSSIER #7-849-B
METRO FORENSICS DIVISION
Midnight Heist Investigation
Applied Forensic Lab: Ratios, Chemical Analysis, & Logic Deduction
Target Grade Grade 7 STEM / ELA
Lead Detective:
Date:
Period:
Badge #:
INCIDENT SUMMARY // 23:42 HOURS
At 11:42 PM, the ancient Golden Scarab of Karnak was stolen from the Antiquities Wing. No alarms tripped, but security cameras caught a fast-moving figure escaping toward the emergency roof exit. Four staff members were detained. Analyze the three evidence stations below to build your case.
1 LAB STATION A: Stride Frequency & Shoe Profile
PHYSICAL EVIDENCE
Wet mud prints across the tile hall measured exactly 25.5 cm long (matching a US Shoe Size 8) with deep chevron lug patterns. The stride distance between consecutive footprints was 140 cm.
Walking Stride: 60 – 75 cm (Normal pace: 1.2 m/s)
Sprinting Stride: 130 – 160 cm (Escape pace: 4.5 m/s)
Task A1: Calculate the ratio of the suspect's stride (140 cm) to normal walking stride (70 cm). Were they walking or sprinting?
CALCULATIONS & VERDICT:
Shoe Tread Match:
2 LAB STATION B: Chemical Residue on Pedestal
FORENSIC CHEMISTRY
Crime lab technicians swabbed a fine luminescent powder off the artifact pedestal. Here are the reagent test outcomes:
| Substance Tested | Vinegar Reaction | UV 365nm Glow | Density |
|---|
| Unknown Pedestal Swab | No bubbling | Vibrant Neon Blue | 3.1 g/cm³ |
| Chalk Dust | Bubbles violently | None (Dull white) | 2.7 g/cm³ |
| HVAC Lubricant Powder | No bubbling | Faint Yellow | 1.2 g/cm³ |
| Lapidary Luminescent Flux | No bubbling | Vibrant Neon Blue | 3.1 g/cm³ |
Task B1: Identify the exact chemical substance recovered from the vault and name which professional trade uses it:
IDENTIFIED SUBSTANCE & EVIDENCE:
3 LAB STATION C: Keycard Security Log & Dropped Cipher
DIGITAL TIMELINE
DROPPED PAGER DECRYPT: CIPHER: SHIFT-3
"VAULT OPENED 23:42 // ROOF HATCH BREACHED AT 23:46 // CARPET COVER AT DOCK ZERO"
Security audit confirmed Card #R-402 (Geology Research Wing) was swiped at the inner vault door at exactly 23:41:50.
Task C1: How many minutes elapsed between the vault swipe and the roof hatch breach? Could someone on crutches walk that in time?
TIMELINE DEDUCTION:
Check your work carefully before cross-referencing suspects on Page 2.
CONTINUE TO SUSPECT DOSSIER PAGE 2 →
CASE FILE #7-849-B PHASE 2: SUSPECT ELIMINATION
Suspect Lineup & Warrant Application
Investigator Name
PERSONS OF INTEREST // DETENTION ROOM INTERROGATION NOTES
A. Marcus "The Hawk" Vance Night Security Guard
Shoe: Size 11
Alibi: Patrolling the 1st floor lobby between 23:30 and 23:55.
Items on Person: Flashlight, ring of 18 brass keys, shoe polish.
Keycard Access: Card #S-104 (General Security).
B. Dr. Elena Rostova Visiting Rare Gem Mineralogist
Shoe: Size 8
Alibi: Claims she was locked in the basement library reading.
Items on Person: UV 365nm inspection pen, vial of lapidary flux.
Keycard Access: Card #R-402 (Geology Research Wing).
C. Jasper Finch Ceramics Restoration Specialist
Shoe: Size 10
Alibi: Left at 23:20 to grab coffee; has time-stamped diner receipt (23:40).
Items on Person: Ceramic chalk polish, receipt, clay scrapers.
Keycard Access: Card #A-209 (Art Conservation).
D. Chloe "Wrench" Torres HVAC Duct Technician
Shoe: Size 9
Alibi: Fixing ventilation fan on the roof from 23:10 to 23:50.
Items on Person: Ratchet set, HVAC lubricant, roof key, sprained ankle.
Keycard Access: Card #M-018 (Maintenance).
FORENSIC ELIMINATION MATRIX Mark: ✓ = Match | ✗ = Disproven / Ruled Out
| Suspect Name | Shoe Size (Size 8) | Sprinting Stride (140 cm) | Chemical Match (Flux) | Keycard Match (#R-402) | Final Verdict |
|---|
| Marcus Vance | | | | | |
| Dr. Elena Rostova | | | | | |
| Jasper Finch | | | | | |
| Chloe Torres | | | | | |
Official Arrest Warrant Application & C-E-R Case Report
JUDICIAL REVIEW
Claim: I hereby charge and request an immediate warrant for the arrest of:
Evidence & Reasoning: Write a structured forensic argument citing at least two specific scientific/mathematical data points (stride/shoe, chemical density/glow, or keycard timestamp) and explain how this disproves the suspect's alibi:
Lead Detective Signature:
Supervisor Approval:
CASE READY FOR PROSECUTION