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JS 112- Crime Scene Procedures


JS 112- Crime Scene Procedures Pre class activities Quiz Announcements and Assignments Acknowledgements Crime Scene Management, First Responders and Processing the ... – PowerPoint PPT presentation

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Title: JS 112- Crime Scene Procedures

JS 112- Crime Scene Procedures
  • Pre class activities
  • Quiz
  • Announcements and Assignments
  • Acknowledgements
  • Crime Scene Management, First Responders and
    Processing the Crime- Fisher Ch 2 and Ch 5
  • a. Management considerations- Information,
    Person power, Technology and Logistics
  • b. Role of the First Responder- Before arriving,
  • c. Secure and Isolate- Multilevel security Walk
  • d. Recording the scene (CSI exercise)
  • e. Communication
  • f. Legal Considerations and Safety

  • Next time- John Jermaine MS. Chemist ATFE Guns,
    Drugs and Bombs, Investigative Chemistry
  • Looking ahead- Weds 03/01/10- Student led
    reviews- E mail summary by 02/28/10 by 1200 noon
  • Monday 03/03/10- Exam I
  • Assignment- Read Chapters 2 and 3

Elements of Crime Scene Management
  • Combined power of crime scenes, physical
    evidence, records and witnesses
  • Use of teamwork, advanced investigative skills,
    ability to process the crime scene properly,
    recognizing, collecting and preserving all
    relevant physical evidence
  • Effectiveness of crime scene functions are only
    as good as management that supports those

Components of an effective crime scene management
  • Information
  • Person power
  • Technology
  • Logistics

Information management
  • Victim- background
  • Actions and whereabouts
  • Belongings accounted for-anything missing
  • Locate family, friends and associates for recent
    events and how the victim got to the scene
  • Motor vehicle registry
  • Extended Victim Background
  • Business, family and personal associates
    identified and interviewed
  • Habitual behaviors
  • Financial affairs-credit cards, bank accounts,
    telephone records
  • Residence and personal belongings inventoried for
    anything missing or out of the norm

Information Management
  • Witnesses
  • Interactions with victim near time of death
  • Clothing, food eaten, trace material foreign
    biological material or drugs taken
  • Find physical evidence to corroborate witness
  • Potential Witnesses
  • Direct witness
  • First responding officer witnesses and
    potential suspects, transient or conditional
    evidence, eg position of the door or on/off light
  • General public
  • Informants

Management of person power
  • Allocation of personnel and training
  • Time, talent, resources
  • Scene documentation
  • Photography
  • Videotaping
  • Sketching
  • Search methods
  • Recognizing, collecting and preserving physical

Information Management
  • Crime scene/evidence
  • Documentation- Photography,sketches, notes
  • Physical evidence-any evidence/object that can
    provide useful information for investigators in
    solving the crime
  • Transient evidence- eg odors, temperatures,
  • Conditional evidence- lighting conditions, smoke
    or fire, precise location of specific pieces of
  • Pattern evidence-Imprints, indentations,
    striations, markings, fractures, blood spatter,
    glass fracture, tire or skid mark, projectile
    trajectory pattern, powder or residue.
  • Transfer evidence- Locard exchange principle-
  • Associative evidence- suspects wallet

Information Management
  • Suspects
  • Background Information- like victim
  • Modus operandi patterns
  • Databases
  • DNA
  • CODIS Combined DNA Index system
  • http//www.fbi.gov/hq/lab/codis/index1.htm
  • The FBI Laboratory's Combined DNA Index System
    (CODIS) blends forensic science and computer
    technology into an effective tool for solving
    violent crimes. CODIS enables federal, state, and
    local crime labs to exchange and compare DNA
    profiles electronically, thereby linking crimes
    to each other and to convicted offenders.

Advances in DNA technology permit analysis of
very small, extremely old evidence
Information Management
  • Databases
  • Fingerprints- Automated Fingerprint
    Identification system-AFIS
  • Many states with millions of fingerprints on file
  • Fingerprints can be checked with latent prints
  • http//www.fbi.gov/hq/cjisd/iafis.htm
  • Cartridge casing and bullets- Drugfire- IBIS
  • DrugFire/IBIS is a ballistic imaging system
    initially designed by the FBI for use in
    counteracting drug and gang shootings in the
    early 1990s. The FBI found that guns used in one
    drug related crime were often used in other
    crimes. A database was created that stores the
    unique markings found on bullets and cartridge

Technology and Equipment
  • Inventory equipment
  • Keep current in technology
  • Know unit limitations
  • Training
  • Equipment
  • Support vehicles
  • Communications
  • Tools and search equipment
  • Specialized crime scene kits
  • Chemical and reagents
  • Evidence packaging materials and forms
  • Portable instrumentation

Management of Logistics
  • Command Posts
  • Media Relations
  • Inter-agency Liason
  • Resource allocations
  • Developing procedures
  • Selecting appropriate crime scene investigation
  • Traditional
  • Crime scene technicians
  • Scene of the crime/major crime squad
  • Laboratory crime scene scientist
  • Collaborative team approach

Forensic Laboratory Management Practices
American Society of Crime Laboratory Directors
  • Provide guidelines to safeguard integrity and
    objectives of criminalistics
  • See Fisher pp 15-20
  • Included are Integrity, quality, security,
    training, competency, communication, public
    responsibility, legal compliance, disclosure and
    discovery, accreditation, certification, research
    and ethics

CSI Crime Scene Before Arriving- Pre-assessment
  • What am I responding to?
  • What do I need to bring?
  • Who do I need to bring?
  • How much time will it take?
  • How long will it take to get there?
  • What has transpired at the scene?
  • Who has been through it?
  • Have you secured the scene?

CSI - Crime Scene -Arriving
  • Get ID ready
  • Park in a place not blocking exits
  • Team approach- Observations to assist in
    determining potential value of evidence
  • What has happened (in agencies eyes)?
  • Who has been in?
  • When did it happen?
  • What has been done?
  • Do we have a search warrant?
  • Some apparent evidence may be superfluous- eg
    medical treatments can create blood/footprints
  • Interview first officer on the scene

First Responders Duties 1
  • Successful resolution of the case may hinge on
    the actions and stops taken by the first
  • First responder duty does not vary due to rank
  • Preserve the integrity of evidence
  • Change to the scene may occur with each contact -
    Locards exchange principle Leverite
  • Value of meticulous note taking
  • Do not approach in haste
  • Calm and Deliberate movements
  • Expect the worst- If something can go wrong it
    will (Murphys law)

First Responders duties (2)
  • Every crime is different not possible to set
    hard and fast rules
  • Generally applicable
  • Secure the scene
  • Responsibility of the first officer on the scene
    to Secure and protect
  • Take measures to isolate the area- ropes,
    barricades and positioning of guards
  • Authority to exclude- Scene security officer
  • Potential destruction of physical evidence
  • Logs- example from SJSU- no one in w/o authority-
    requiring report
  • Critical to the investigation

Multi-level security approach
  • Level 1 Overall scene security- restriction of
    general public set up special media area
  • Level 2 Area security- restriction to official
    business- higher ranking officers and officials-
    Set up command post for briefings, logistics,
    break and rest areas
  • Level 3 Target Area security- highest limited
    access only for crime scene investigators

First Responders duties (3)
  • Arrest the suspect-
  • Check for weapons
  • Do not let suspect back to scene
  • Document condition, injuries and behavior of
  • Assist the victim
  • Injured person on the scene-administer first
    aid--- even if evidence lost or destroyed
  • Dead body-Homicide?
  • Dead person- do not touch. Use a phone not
    radio due to press
  • Summon the coroner
  • Record the time
  • Critical to the investigation
  • Estimate what may have happened

First Responders duties (4)
  • What to do until investigating personnel arrive
  • Write down names of witnesses and other persons
    who entered the scene
  • Note who was at the scene when the officer
  • Establish the basic facts
  • Keep suspect and witnesses separated wherever
  • Instruct witnesses not to discuss the events
  • Do not discuss the crime with witnesses or
  • Listen attntively but unobtrusively
  • Protect evidence that is in danger of being
  • Continued protection of the scene
  • No one allowed without investigators

First Responder Duties (5)
  • Observe transient evidence
  • Doors, windows, lights, shades, odors, signs of
    activity, date and time indicators, mail,
    newspapers etc.
  • First officer should remain and send others to
    call headquarters
  • Inteview/Detain witnesses
  • Communicate with supervisors
  • Report all actions, observations and changes

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Legal Considerations
  • Removal of any evidence from a person of from the
    scene of a crime in conformity with Fourth
    Amendment privileges
  • The right of the people to be secure in their
    persons, houses, papers, and effects, against
    unreasonable searches and seizure, shall not be
    violated and no warrants shall issue, but upon
    probably cause, supported by oath or affirmation,
    and particularly describing the place to be
    searched, and the persons or things to be seized.

Legal Considerations
  • Justification of warranties searches
  • Existence of emergency
  • Need to prevent immediate loss or destruction of
  • Search of a person and property within the
    immediate control of the person provided it is
    made incident to a lawful arrest
  • Search made by consent of the parties involved
  • Message from Supreme Court-when time and
    circumstance permit obtain a search warrant
  • Mincey vs Arizona-
  • Police raid on suspected drug dealer Rufus Mincey
  • Undercover officer forced entry pretext of buying
    drugs and was killed in scuffle.
  • Collected evidence including bullets, drugs and
    paraphernalia over 4 days without warrant
  • Violated 4th amendment rights court unanimously

Fundamental Practices Crime Scene Safety
  • AIDS, hepatitis B and TB- Inoculation for
    hepatitis B
  • OSHA
  • Double glove, tyvek shoe covers, coveralls
  • Particle masks, respirator, goggles or face
  • Sharp objects- appropriate container
  • Blood latent print powder brush needs to be
    decontaminated or disposed
  • Biohazard bags for infectious materials used
    gloves etc.
  • Notes taken with uncontaminated gloves
  • Soiled protective equipment needs to be removed
    and decontaminated
  • Eating and drinking is prohibited

Summary (1)
  • Physical evidence has many uses- establish a
    crime has been committed, exonerate the innocent,
    establish links, corroborate statements, provide
    investigative leads
  • Examples of physical evidence include drugs,
    hair, fibers, fingerprints, bullets, paint, ropes
    and shoeprints.
  • The goal of identification is to determine the
    physical or chemical identity of a substance.
    Contrast this to individualization that is to
    determine that an item has come from a unique

Summary (2)
  • Elements of crime scene management include
    teamwork, information, person power, technology
    and logistics
  • ASCLD has published guidelines to insure
    integrity and objectives
  • First responder duties may vary depending on the
    crime. Duties that are common include preserving
    the integrity of the evidence, secure the scene,
    arrest the suspect, assist the victim, record the
    time, note transient evidence, interview
    witnesses and communicate to supervisors
  • Legal considerations include fourth amendment
    privileges and getting a warrant before
    processing the scene
  • Safety considerations include AIDS, hepatitis B
    and TB
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