THE CRIME SCENE CHAPTERS 4 & 5

PROCESSING THE CRIME SCENE

DEFINING A CRIME SCENE  Primary Crime Scene  Secondary Crime Scene  Macroscopic  Microscopic

PHYSICAL EVIDENCE  Relation between  VICTIM  SUSPECT  SCENE  OBJECTS  PHYSICAL EVIDENCE

INFORMATION FROM EVIDENCE  VERIFY STATEMENTS  IDENTIFICATION OF SUSPECTS  AFIS, CODIS  SUBSTANCE IDENTIFICATION  DRUGS, ACCELERANTS,  SCENE RECONSTRUCTION  INVESTIGATIVE LEADS

LOCARD’S EXCHANGE PRINCIPLE  Whenever two objects come into contact, a mutual exchange of matter will take place between them.

SCIENTIFIC METHOD  METHODOLOGICAL  SYSTEMATIC  LOGICAL  APPLICATION OF KNOWLEDGE

CRIME SCENE MANAGEMENT  ABILITY TO SOLVE CRIME A TEAM EFFORT  INFORMATION MANAGEMENT  MANPOWER MANAGEMENT  TECHNOLOGY MANAGEMENT  LOGISTICS MANAGEMENT

FIRST RESPONDERS  Assist the victim  Search for / arrest suspect  Detain witnesses / keep separate  PROTECT CRIME SCENE / LOG  DO NOT SMOKE, DRINK OR EAT  Infect self  Contaminate scene  Communicate all information to detectives

CRIME SCENE PROCEDURES  SECURE SCENE  SURVEY SCENE  Minimize contact by ALL personnel  Use Personal Protective Equipment  Note evidence  Protect evidence that may be lost  Note weather conditions  Use alternate entry  Record EVERYTHING

APPROACH THE SCENE APPROACH THE SCENE

SECURE AND PROTECT THE SCENE

PRELIMINARY SURVEY OF THE SCENE

NARRATIVE: DESCRIPTION OF THE SCENE NARRATIVE: DESCRIPTION OF THE SCENE

CRIME SCENE DOCUMENTATION  NOTES  VIDEO  PHOTOGRAPHY  SKETCHES

CRIME SCENE DOCUMENTATION  NOTES  Immediate  Accurate  Continuing  VIDEO  3D Documentation of scene  Orientation of scene but no narrative  DO NOT EDIT

PHOTOGRAPH THE SCENE

CRIME SCENE DOCUMENTATION  PHOTOGRAPHY  BEFORE MOVING EVIDENCE  SYSTEMATIC  OVERVIEW  MIDRANGE  CLOSE-UP  LOG / CAMERA SETTINGS  SCALE

Three Types of Photographs  1. Overall  2. Midrange  3. Closeup

CRIME SCENE DOCUMENTATION  SKETCHES  Assign measurements to objects  Triangulation  Baseline  Polar Coordinates  Rough / finished  Legend

SKETCH THE SCENE

Rough Sketch

Finished Sketch

CRIME SCENE SEARCH  SYSTEMATIC / METHODICAL  LINE  GRID  ZONE  WHEEL  SPIRAL

Search Patterns

EVALUATION OF THE PHYSICAL EVIDENCE AT THE SCENE

COLLECTION & PRESERVATION OF PHYSICAL EVIDENCE  One CSI in charge  Priority to easily destroyed evidence  Primary packaging  Contain and protect  Secondary packaging  Seal and tamper resistant  INITIAL / DATE / TIME  Identity of item enclosed

Evidence Bindles

DETAILED SEARCH OF THE SCENE

COLLECTION & PRESERVATION OF PHYSICAL EVIDENCE  Each item separate  Wet items  Temporary in plastic  Air Dry  Permanent in paper  Arson evidence – air tight containers  Controls

COLLECTION, RECORDING, MARKING AND PRESERVATION OF EVIDENCE  What constitutes a seal?  Initials on article or container  Description of contents  Paper is our friend!  Evidence Bindle

PROCESS THE SCENE FOR LATENT PRINTS AND COLLECT ANY PRINTS DEVELOPED

CRIME SCENE RECONSTRUCTION  Data Collection  Conjecture  Hypothesis Formulation  Testing  Theory

FINAL SURVEY!!! STOP AND THINK OF ANYTHING FURTHER THAT MIGHT BE COLLECTED.

RELEASE OF THE CRIME SCENE