Bloodstain Pattern Analysis

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Bloodstain Pattern Analysis. Collection and Preservation of Evidence. Goals. Students- will understand the importance of blood spatter evidence at a crime scene. Objectives. Students will: Discuss what can be learned from bloodstain patterns - PowerPoint PPT Presentation

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  • Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Collection and Preservation of Evidence

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Goals

    Students- will understand the importance of blood spatter evidence at a crime scene Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • ObjectivesStudents will:

    Discuss what can be learned from bloodstain patternsExplain the difference among low, medium, and high velocity spattersDetermine the direction of blood spatter and points of convergence

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    A field of forensic study that deals with the physical properties of blood and patterns produced under different conditions as a result of various forces being applied to the bloodBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Pop QuizThrough Blood spatter analysis we can tell which of the following?A.B.C.D.Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Enables reconstruction of events of the crime

    A tool that can help prove who committed the crime

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Can determine:Point(s) of originType of force usedNumber of blowsSequence of eventsPosition of victim and perpetratorMovement of people and objectsBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Determine direction blood was travelingConfirm/refute assumptions made by investigators of events and their sequenceConfirm/refute statements made by witnesses of events and their sequenceBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Factors that do not affect analysis:Age of bleeding personSex of bleeding personDisease present in bleeding personAlcohol level of bleeding personTemperature of scene Humidity of scene

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Web Field TripDid you all remember to bring in your permissions slips, signed by your mom?Here are the rules:Click onto the ips address on the next slideMagically, you will be transported to our web field trip siteWatch/listen to the video (it is 6 minutes long).Then COME BACK! no skipping out, sneaking off to the refrig, or checking out what is happening on TV!When you return, we will resume class. :o)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Please click onto the ips address below:http://www.youtube.com/watch?v=Od8YuwUT794

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    When attempting to reconstruct the events that led to bloodstain spatter, document:Size of the stainShape of the stainDistribution of stains in the patternLocation of stainsDirection of the stainsDensity of the stain

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis

    Diameter of a drop of blood depends on:Volume of the bloodDistance of the fallSurface texture Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Surface Texture *Bloodstain Pattern Analysis

    Bloodstain Pattern Analysis

  • Direction of TravelBloodstain Pattern Analysis *

    Stain shape will indicate direction of travelRound 90 degElongated - angleRound smooth end toward the originTail end points in the direction of travel

    Bloodstain Pattern Analysis

  • Proper DocumentationBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Points of Convergence

    Drawing lines along long axis of several stains will show a point of convergence at their originBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Area of Convergence

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Impact Spatters

    Impact Spatter: Bloodstain pattern normally consisting of small spots of blood, varying greatly in size and number, which results from a source of blood being subjected to an impactBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Impact Spatters

    Low Velocity Impact Spatter (LVIS)

    Medium Velocity Impact Spatter (MVIS)

    High Velocity Impact Spatter (HVIS)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Low Velocity Impact Spatter (LVIS)

    Bloodstain pattern caused by a low velocity impact being applied to a source of blood

    Sources:Open bleeding woundsObjects saturated with blood

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Medium Velocity Impact Spatter (MVIS)

    Bloodstain pattern caused by moderate amount of force applied to a source of bloodSourcesBeatingsFist, boot, baseball batKnifingsDrops may travel long distancesBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • High Velocity Impact Spatter

    Bloodstain pattern caused by high amount of force applied to source of bloodSourcesGunshotsExplosionMechanical accident (i.e. walking into airplane propeller)Does not travel very far

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Large Volume Bloodstain Patterns

    Splashed PatternsRelatively large amounts of bloodReleased under influence of gravityTravels as a mass of blood until it hits a surfaceAssociated with traumatic bleeding from vessels under low pressure (veins)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Large Volume Bloodstain Patterns

    Projected Pattern Gush PatternRelatively large amount of bloodReleased under pressureAssociated with traumatic bleeding from vessels under high pressure (artery)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Arterial GushBloodstain Pattern Analysis *

    Blood exiting the body due to traumatic bleeding (breached artery)

    Bloodstain Pattern Analysis

  • Large Volume Bloodstain PatternsBloodstain Pattern Analysis *Projected Pattern

    Bloodstain Pattern Analysis

  • Large Volume Bloodstain Patterns

    Blood into BloodCreated by drops of blood falling into pool of blood or creating pool of blood as it fallsConsists of central pool of blood surrounded by satellite stainsSatellite stains are usually circular and heavy in appearanceCan easily be mistaken for impact splatter when viewed only on a vertical surface (side of a tennis shoe)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Blood into BloodBloodstain Pattern Analysis *

    Results from blood dripping into blood

    Bloodstain Pattern Analysis

  • Cast-Off Patterns

    Created by blood thrown from a bloody object during whip-like termination of a back strokeCharacterized by linear (in-line) stain patternShape of drops change from round on the end near origin to elongated at far endCan tell:Minimum number of blowsWhere the killer was when the blows were administered

    Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Transfer/Contact Patterns

    Transfer of blood from one object to another as result of contact

    Recognizable imprint patterns can be created by contact with a bloody objectBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Transfer/Contact Pattern

    Created when a wet bloody surface comes into contact with a second surface *Bloodstain Pattern Analysis

    Bloodstain Pattern Analysis

  • Transfer/Contact Patterns

    Swipe - stain created when a bloody object contacts a non-bloody surface in a swiping motion

    Wipe - stain created when a non-bloody object wipes through a bloody surfaceBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Swipe PatternTransfer of blood from a moving source onto an unstained source (i.e. bloody hair)Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Wipe Pattern

    Created when a non-bloody object wipes through a bloody surfaceBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Trail Pattern

    Results from drops of blood falling from a moving source of bloodComposed of drops of blood forming a trail of bloodDepending on speed of moving source of blood, the drops may show direction of travelBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Trail PatternBloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Voids and Limiting AnglesVoid a pattern recognized by absence of blood in an area where blood would be expected, denoted by a distinct borderLimiting Angle - can be used to limit location of the point of originConsider which surfaces have bloodstains Point of origin of a bloodstain is limited to the area within range of that surface Bloodstain Pattern Analysis *

    Bloodstain Pattern Analysis

  • Void PatternBloodstain Pattern Analysis *

    Recognized by the absence of blood in an area where blood would be expected, denoted by a disti

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