Dr. Henry C. Lee Chief Emeritus, Connecticut State Police Professor, University of New Haven Director, Forensic Research Center New Investigative Techniques
Information Theory Criminal Investigation
Investigative Technology Image Enhancement & Analysis Image Enhancement & Analysis Digital Video Recording & Analysis Digital Video Recording & Analysis Crime Scene Site Identification Crime Scene Site Identification Electronic Monitoring Electronic Monitoring Artificial Intelligence Artificial Intelligence Biometric Identification Biometric Identification Crime Mapping & Analysis Crime Mapping & Analysis Pattern Evidence Analysis Pattern Evidence Analysis Data Collection & Data Mining Data Collection & Data Mining Reconstruction of Crime Scene Reconstruction of Crime Scene
Scene Process Laboratory Process Court Process Recognition Documentation Reservation Collection Identification Comparison Individualization Reconstruction Interpretation
Crime Scene Crime Scene Type of scene - indoor vs outdoor - primary vs secondary - organized vs unorganized - staged vs normal - dynamic vs passive - universal vs. microscopic
Transient Evidence 蹈 臨時鏗物証 Pattern Evidence 痕跡鏗物証 Conditional Evidence 情况鏗物証 Transfer Evidence 移轉鏗物証 Associative Evidence 連鎖鏗物証
Pattern Evidence Recognition of pattern Identification of pattern Documentation of pattern Enhancement of Pattern Comparison of pattern. Mechanism of transfer
Bloodstain Patterns Drop, Drip and Satellite Pattern Drop, Drip and Satellite Pattern Swipe, Wipe and Smudges Swipe, Wipe and Smudges Impact, Splash, and Gushing Impact, Splash, and Gushing Contact and Transfer Contact and Transfer Cast off and Wave Cast off Cast off and Wave Cast off Imprint and Impression Imprint and Impression Low, Medium and High Impact Spatter Low, Medium and High Impact Spatter
Blood as Evidence PATTERN PATTERN Location of Stain Position of stain Direction of stain Condition of stain Size & shape of stain Amount & distribution of stain TYPING TYPING ABO System Red cell system Serum grouping Isoenyme typing DNA Sex, Race, Age, Other determination
Types of Pattern on Body Mark Made By Human Mark Made By Human Mark Made By Weapons Mark Made By Weapons Mark Made By Tools Mark Made By Tools Mark Made By Animals Mark Made By Animals Mark Made By Objects Mark Made By Objects Mark Made By Vehicle Mark Made By Vehicle Mark Made By Clothing Mark Made By Clothing
Imprint Impression Evidence Human – Fingerprint, Footprint, Lip print, Ear print, Body print, Handwriting. Animal – Paw print, Body print. Vehicle – Tire Track, Impact Pattern, Damage Pattern. Clothing- Fabric Pattern, Logo Imprint, Accessory Imprint, Shoe Patterns Objects – Tool-marks, Bullets & Casings, Weapon Pattern, Typewriter & Pattern, Marks & Trade Stamps.
Methods for Pattern Enhancement 1) Photographic Methods 2) Chemical Methods 3) Lighting and Filtering 4) Casting and Lifting
Imprint Pattern Evidence at Scene Finger / hand prints Finger / hand prints Foot / shoe prints Foot / shoe prints Tire marks Tire marks Bullet striations Bullet striations Casing imprints Casing imprints Handwritings Handwritings Ear prints / nose prints Ear prints / nose prints Cutting mark of Body parts Cutting mark of Body parts Machine marks Machine marks Tool marks Tool marks
Physical Pattern on Body Footprint patterns Footprint patterns Tool mark patterns Tool mark patterns Shoeprint patterns Shoeprint patterns Tire track patterns Tire track patterns Bloodstain patterns Bloodstain patterns Semen strain patterns Semen strain patterns Wound / injury patterns Wound / injury patterns Rope/Ligature Marks Rope/Ligature Marks Weapon Marks Weapon Marks
Types of Pattern on Body Mark Made By Human Mark Made By Human Mark Made By Weapons Mark Made By Weapons Mark Made By Tools Mark Made By Tools Mark Made By Animals Mark Made By Animals Mark Made By Objects Mark Made By Objects Mark Made By Vehicle Mark Made By Vehicle Mark Made By Clothing Mark Made By Clothing
Mark Made By Human Bite Mark Bite Mark Fingerprint Fingerprint Footprint Footprint Handprint Handprint Nail Mark Nail Mark Wound Pattern Wound Pattern
Mark Made by Animals & Insects Dog bite Claw Marks Insect Bite Animal Bite Scratch Marks Bacteria Infection
Mark Made By Tools Mark Made By Tools Mark Made By Weapons Mark Made By Weapons Mark Made By Vehicle Mark Made By Vehicle Mark Made By Clothing Mark Made By Clothing Mark Made By Object
Mark Made By Weapon Sharp Instrument Sharp Instrument Blunt Instrument Blunt Instrument Gunshot Wound Gunshot Wound Rope/Ligature Rope/Ligature Burn Patterns Burn Patterns
Types of Sharp Force Injury Stabbing Wound Stabbing Wound Cutting Wound Cutting Wound Chopping Wound Chopping Wound Slashing Wound Slashing Wound Scraping Wound Scraping Wound
Knife Speer SwordNeedle ArrowScrewdriver AxeIce pick MacheteGlass Hatchet Meat Clever AxeScissor
Sharp Force Wound Sharp Force Wound Sharp edges, Clear penetration and separation Blunt Force Injury Blunt Force Injury Blunt-impact-crushes & tear Laceration-Abraded edges, undermined
Knife Spear SwordNeedle ArrowScrewdriver AxeIce pick MacheteGlass Hatchet Meat Clever Needle, NailScissor
Lacerations Split Bridge of soft tissue Abraded Edge Marginal Abrasion Patterned Abrasion Chipping Special Wound Pattern
Gun Shot Wound Contact Close Range Intermediate range Distant range
Contact Discharge Muzzle against the skin Muzzle against the skin Single and circular wound Single and circular wound Entrance hole approximate diameter of bore Entrance hole approximate diameter of bore Little or no soot on skin Little or no soot on skin Little or no burn on skin Little or no burn on skin Muzzle mark on skin Muzzle mark on skin GSR in wound track GSR in wound track
Close Range Discharge 1.Muzzle near skin (not a contact) 2.Circular Wound – right angle 3.Elliptical wound – slanted angle 4.Nibbling / cremation around wound edge 5.Blackened / soot on edge of wound 6.Annular / distant bruising 7.Singeing of hair / skin 8.GSR around wound
Mid-range Discharge 1.Smoke / soot diminished 20-40cm 2.Muzzle to target – 15cm to 2 m 3.Powder tattooing around wound cm 4.Cremated / scalloped wound edges 5.One central entrance hole 1m 6.Satellite holes around central hole – 1m
Distance Discharge 1.Muzzle to target - 2m 2.No burning / soot on skin 3.Few GSR particles 4.Wad may be present – 5m 5.Central hole diminished m 6.Spread of pellets increase
Mark Made by Animals & Insects Dog bite Claw Marks Insect Bite Animal Bite Scratch Marks Bacteria Infection
Examination of Pattern Evidence Recognition of pattern Documentation of pattern Identification of pattern Comparison of pattern. Mechanism of transfer
Recognition of Pattern Evidence Imprint vs.Indentation Human vs. Animal origin Weapon vs. Artificial mark Direct vs. Secondary Bloody Imprint vs. Impression in Blood
Documentation of Pattern Evidence Photographs Video Taping Notes Diagrams Sketches Recording
Identification of Pattern Evidence Pattern made by hands Pattern made by foot Pattern made by Rope Pattern made by Weapons Pattern made by Teeth, Nail Pattern made by Vehicle Pattern made by Objects