Evidence - Fillingham

Evidence - Fillingham

EVIDENCE CLASSIFICATION OF EVIDENCE Testimonial Evidence: statement made under oath direct evidence eyewitness evidence* Physical evidence: any object or material that is relevant in a crime real evidence Examples:hair, fiber, fingerprints, documents, blood,

soil, drugs, toolmarks, impressions, glass physical and chemical properties RELIABILITY OF EYEWITNESSES Factors that affect accuracy: Nature of the offense and the situation in which the crime is observed Characteristics of the witness Manner in which the information is retrieved

Additional factors: Witnesss prior relationship with the accused Length of time between the offense and the identification Any prior identification or failure to identify the defendant Any prior identification of a person other than the PHYSICAL EVIDENCE Is generally more reliable than testimonial evidence

Can prove that a crime has been committed Can corroborate or refute testimony Can link a suspect with a victim or with a crime scene Can establish the identity of persons associated with a crime RECONSTRUCTION Physical evidence can be used to answer questions about: What took place at a crime scene

The number of people involved The sequence of events A forensic scientist compares the questioned (Q) (unknown) sample from the crime scene with a sample of known (K) origin. TYPES OF PHYSICAL EVIDENCE Transient evidence Pattern evidence

Conditional evidence Transfer evidence Associative evidence TRANSIENT EVIDENCE Temporary Easily changed or lost Usually observed by the first officer at the scene. Examples: Odorputrefaction, perfume, gasoline, urine, burning,

explosives, cigarette or cigar smoke Temperaturesurroundings, car hood, coffee, water in a bathtub, cadaver Imprints and indentations footprints, teeth marks in PATTERN EVIDENCE Produced by direct contact between a person and an object or between two objects

Mostly in the form of imprints, indentations, striations, markings, fractures, or deposits Blood spatter Glass fracture Fire burn pattern Furniture position Projectile trajectory Tire marks or skid marks Clothing or article distribution Gunpowder residue Material damage

Body position Toolmarks Modus operandi PATTERN EVIDENCE CONDITIONAL EVIDENCE Produced by a specific event or action Important in crime scene reconstruction, determining circumstances or event sequence indirect evidence

Smokecolor, direction of travel, density, odor Vehiclesdoors locked or unlocked, windows opened or closed, radio off or on, odometer mileage Firecolor and direction of the flames, speed of spread, temperature and condition of fire Bodyposition and types of wounds; rigor, livor, and algor mortis

Locationof injuries or wounds, of bloodstains, of the victims vehicle, of weapons or cartridge cases, of broken glass Scenecondition of furniture, doors and windows, any disturbance or signs of a struggle Lightheadlight, lighting conditions, lights on or off TRANSFER EVIDENCE

Produced by contact between person(s) and object(s), or between person(s) and person(s). ASSOCIATIVE EVIDENCE Something that may associate a victim or suspect with a scene or with each other; e.g., personal belongings. CLASSIFICATION OF EVIDENCE BY NATURE Biologicalblood, semen, saliva, sweat, tears, hair, bone,

tissues, urine, feces, animal material, insects, bacteria, fungi, botanical material Chemicalfibers, glass, soil, gunpowder, metals, minerals, narcotics, drugs, paper, ink, cosmetics, paint, plastic, lubricants, fertilizer Physicalfingerprints, footprints, shoeprints, handwriting, firearms, tire marks, tool marks, typewriting Miscellaneouslaundry marks, voice analysis, polygraph, photography, stress evaluation, psycholinguistic analysis, vehicle identification INDIVIDUAL VS. CLASS

EVIDENCE Individualcan be identified with a particular person or a single source Classcommon to a group of objects or persons relies on statistics! Fingerprints Blood DNA Typing INDIVIDUAL VS. CLASS EVIDENCE

These fibers are class evidence; there is no way to determine if they came from this garment. The large piece of glass fits exactly to the bottle; it is individual evidence. INDIVIDUAL VS. CLASS EVIDENCE Which examples do you think could be individual evidence?

STEPS IN A FORENSIC INVESTIGATION 1. Recognition 2. Preservation 3. Identification 4. Comparison 5. Individualization 6. Interpretation 7. Reconstruction STEPS IN A FORENSIC

INVESTIGATION 1. Recognition of evidence the ability to distinguish important evidence from unrelated material pattern recognition

physical property observation information analysis field testing 2. Preservation of evidence collection proper packaging STEPS IN A FORENSIC

INVESTIGATION 3. Identification of evidence: scientific testing of physical/chemical properties morphology biological and immunological properties 4. Comparison of evidence class characteristics measured against those of known standards or controls

if all measurements are equal, then the two samples may be considered to have come from the same source or origin STEPS IN A FORENSIC INVESTIGATION 5.Individualization of evidence demonstrating that the sample is unique, even among members of the same class 6.Interpretation of evidence

giving meaning to all the information 7.Reconstruction of the crime Inductive and deductive logic Statistical data Pattern analysis Results of laboratory analysis

Recently Viewed Presentations

  • Barbara A. Wilson, Eve Greenfield, Linda Clare, Alan

    Barbara A. Wilson, Eve Greenfield, Linda Clare, Alan

    Validity Factor analytic results confirmed the construct validity of forming a GMI Ecological validity (as supported by performance against the Prospective and Retrospective Memory Questionnaire; Smith et al., 2000) was moderate (r =-.43 Version 1; r=-.44 Version 2) Performance of...
  • SOCIAL STUDIES FRAMEWORKS UPDATE - Nassau BOCES

    SOCIAL STUDIES FRAMEWORKS UPDATE - Nassau BOCES

    INQUIRY ARC. A visual representation of the arc shows us that content is still at the heart of what we do. T. he Inquiry Arc highlights the structure of and rationale for the organization of the Frame-work's four Dimensions.
  • Landmarks and Monuments: Learning About a Community Project

    Landmarks and Monuments: Learning About a Community Project

    Landmarks and Monuments: Learning About a Community Project compiled by the Learning Circle Students at The Aga Khan Academy, Mombasa
  • Medical Errors, Negligence, and Litigation

    Medical Errors, Negligence, and Litigation

    Medical Errors, Negligence, and Litigation All Errors are not Negligent Negligent Medical Injuries Percent of Injuries due to Negligence Proportion of Adverse Events Involving Negligence Rates of Adverse Events and Negligence by Specialty Percent of Negligent Injuries that File a...
  • Reimbursement Issues

    Reimbursement Issues

    * Expectorants are commonly used in patients with COPD in whom mucus is thick and hard to expectorate. GI upset is a common adverse reaction. Expectorants may increase bleeding tendencies in patients taking anticoagulants. What patient teaching should be implemented...
  • DPR305: MVC, MVP and MVVM: A Comparison of Architectural Patterns

    DPR305: MVC, MVP and MVVM: A Comparison of Architectural Patterns

    What This Session Is And What It Is Not. It is: An investigation of how different software architecture patterns relate to different Microsoft developer technologies
  • Classical Control Theory for Computer Science

    Classical Control Theory for Computer Science

    float. Output . valve. Goal: Design the input valve control to maintain a constant height regardless of the setting of the output valve (height) (input flow) (output flow) (volume) (resistance) This can be applied to computer systems as a fluid...
  • European Roadmaps for Research Infrastructures presentation by Hans

    European Roadmaps for Research Infrastructures presentation by Hans

    European Roadmaps for Research Infrastructures presentation by Hans Chang (chair ESFRI) (1st meeting ESFRI Steering Groups, autumn 2005)