000°
090°
180°
270°
0%
ANALYZING
PROTOCOL 03 // FIREARMS & BALLISTICS

Forensic Ballistics & Toolmarks

CALIBRATING EVIDENCE SENSORS...

INFINITE FORENSICS
Back to Investigation Methodology
DOSSIER #IF-DOM-03
PROTOCOL 03 // FIREARMS & BALLISTICS

Forensic Ballistics & Toolmarks

Striation Matching, Firearms Identification & Trajectory Reconstruction

"Every barrel cuts unique microscopic microscopic striations into a bullet. The rifling is the firearm's mechanical fingerprint."

The scientific examination of firearms, spent cartridge casings, fired projectiles, toolmarks, and gunshot residues (GSR) to connect a physical firearm to a crime scene and reconstruct shooting trajectories.

CORE INTELLIGENCE
VERIFIED SYLLABUS
EXHIBIT CODE:IF-DISC-003
PRIMARY PROTOCOL:Section 45 IEA / BSA Standards
INSTRUMENT TIME:Active Bench Casework
INDUSTRY OUTLOOK:High Vocational Demand
Launch Virtual Interactive Lab →
CORE FORENSIC PRINCIPLE

Foundational Admissibility Law

Toolmark Uniqueness: Tool manufacturing leaves microscopic, random imperfections on breech faces, firing pins, and rifling lands that transfer uniquely to softer brass and lead during weapon discharge.

Judicial Standing: Conclusive forensic opinion establishing whether a specific weapon fired the recovered ammunition, backed by microphotographic exhibits.
SCIENTIFIC & EMPIRICAL BASIS

Analytical Methodology

Divided into internal ballistics (in-bore mechanics), external ballistics (trajectory & aerodynamic drag), and terminal ballistics (tissue cavitation & entry/exit wounds).

  • Test firing exemplar ammunition into water tanks to capture pristine baseline striations
  • Comparison microscopy bridging crime scene casing with test-fired exemplar
  • SEM-EDX elemental triage for primer residue particles (Pb-Ba-Sb)
STANDARD OPERATING CASWORK WORKFLOW

How An Examiner Investigates This Evidence

From scene cordoning to laboratory instrumentation and final deposition.

01STAGE 01

Caliber & Toolmark Micrometry

Measure casing dimensions, primer indentation depth, and firing pin geometry against AFTE standardized databases.

02STAGE 02

Comparison Microscopy Striation Matching

Superimpose land and groove engraving patterns across an optical split hairline to confirm identical tooling signatures.

03STAGE 03

Shooting Reconstruction & GSR Mapping

Reconstruct muzzle-to-target distance and trajectory angles using laser rods and sodium rhodizonate chemical mapping.

Primary Laboratory Instruments & Software

Official instrumentation deployed across accredited FSLs & independent crime labs.

1Split-Screen Comparison Microscope (Leica FS M / Projectina)
2Scanning Electron Microscope with Energy Dispersive X-ray (SEM-EDX)
33D Laser Trajectory Reconstruction Systems (Faro / Leica Geosystems)
4Integrated Ballistics Identification System (IBIS / BrassTrax)
5Digital Precision Calipers & Water Recovery Deceleration Tanks
EVIDENCE VAULT EXPLORATION

Inspect Other Forensic Domains

View Full Scene Grid →
#01
Dactyloscopy & Friction Ridge Analysis
Latent Fingerprints, Palmprints & Minutiae Point Identification
Inspect Dossier
#02
Forensic Serology & DNA Profiling
Biological Fluid Identification, STR Multiplexing & Genetic Kinship
Inspect Dossier
#03
Forensic Ballistics & Toolmarks
Striation Matching, Firearms Identification & Trajectory Reconstruction
● Currently Viewing
#04
Questioned Document Examination
Handwriting Analysis, Signature Authentication, Altered Inks & ESDA
Inspect Dossier
#05
Digital & Cyber Forensics
Bit-Stream Acquisition, Hex Carving, Mobile Forensics & Section 65B IEA
Inspect Dossier
#06
Forensic Toxicology & Chemical Analysis
Xenobiotic Isolation, Gas Chromatography-Mass Spectrometry & Poison Quantification
Inspect Dossier