Podcast
Questions and Answers
What is the primary goal of maintaining the chain of custody when processing evidence?
What is the primary goal of maintaining the chain of custody when processing evidence?
What type of evidence provides a direct link between the suspect and the crime scene?
What type of evidence provides a direct link between the suspect and the crime scene?
What is the term for the process of comparing a piece of evidence with a known standard?
What is the term for the process of comparing a piece of evidence with a known standard?
What is the purpose of eliminating prints from a crime scene?
What is the purpose of eliminating prints from a crime scene?
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What is the term for the contamination of evidence through the introduction of extraneous material?
What is the term for the contamination of evidence through the introduction of extraneous material?
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What is the term for the study of the characteristics of a firearm, such as the rifling and striations on a bullet?
What is the term for the study of the characteristics of a firearm, such as the rifling and striations on a bullet?
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What is forensic science, according to Fantino (2007)?
What is forensic science, according to Fantino (2007)?
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What is considered the best evidence in a legal sense?
What is considered the best evidence in a legal sense?
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What type of evidence is established by law?
What type of evidence is established by law?
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What is the primary difference between direct and indirect evidence?
What is the primary difference between direct and indirect evidence?
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What type of evidence links a suspect with a crime?
What type of evidence links a suspect with a crime?
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What is the purpose of hair evidence in a criminal investigation?
What is the purpose of hair evidence in a criminal investigation?
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What is the primary role of a crime scene investigator?
What is the primary role of a crime scene investigator?
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What is the main purpose of reviewing the FBI Handbook of Forensic Services?
What is the main purpose of reviewing the FBI Handbook of Forensic Services?
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What is the primary purpose of the Property Room Web site?
What is the primary purpose of the Property Room Web site?
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What is the main focus of the class assignment on group discussions?
What is the main focus of the class assignment on group discussions?
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What is the primary role of a Crime Scene Investigator (CSI)?
What is the primary role of a Crime Scene Investigator (CSI)?
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What is the 'CSI effect'?
What is the 'CSI effect'?
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What is the 'tech effect'?
What is the 'tech effect'?
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Why is selecting the right equipment for a crime scene important?
Why is selecting the right equipment for a crime scene important?
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What is the purpose of documenting the chain of evidence?
What is the purpose of documenting the chain of evidence?
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Why is maintaining the integrity of evidence crucial?
Why is maintaining the integrity of evidence crucial?
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What is Locard's principle of exchange?
What is Locard's principle of exchange?
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What is the purpose of cordoning off the crime scene?
What is the purpose of cordoning off the crime scene?
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What is the primary concern when transporting equipment to a crime scene?
What is the primary concern when transporting equipment to a crime scene?
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Why is training in equipment use important?
Why is training in equipment use important?
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What is the primary purpose of using forensic light sources in crime scene investigations?
What is the primary purpose of using forensic light sources in crime scene investigations?
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What is the main requirement for law enforcement to gather evidence under the Brady rule?
What is the main requirement for law enforcement to gather evidence under the Brady rule?
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What is the purpose of marking and identifying evidence at the crime scene?
What is the purpose of marking and identifying evidence at the crime scene?
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What is the primary concern in managing evidence and property?
What is the primary concern in managing evidence and property?
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What is the standard of comparison in forensic science?
What is the standard of comparison in forensic science?
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What is the primary purpose of using lasers in investigations?
What is the primary purpose of using lasers in investigations?
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What is the main requirement for transporting evidence?
What is the main requirement for transporting evidence?
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What is the primary concern in storing evidence?
What is the primary concern in storing evidence?
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What is the main requirement for exhibiting evidence in court?
What is the main requirement for exhibiting evidence in court?
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What type of analysis can distinguish trace hair samples using consumer chemicals as identifiers?
What type of analysis can distinguish trace hair samples using consumer chemicals as identifiers?
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What is the main characteristic of class characteristics in evidence?
What is the main characteristic of class characteristics in evidence?
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What type of evidence can be found on the suspect or victim's body or on anything else placed in the mouth?
What type of evidence can be found on the suspect or victim's body or on anything else placed in the mouth?
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What is the term for the prints that are not readily seen but can be developed through powders or chemicals?
What is the term for the prints that are not readily seen but can be developed through powders or chemicals?
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What is the purpose of the Glass Evidence Reference Database?
What is the purpose of the Glass Evidence Reference Database?
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What type of evidence can be used to track criminals as well as people in need of help?
What type of evidence can be used to track criminals as well as people in need of help?
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What is the purpose of using black lifters for light powders and light lifters for black powders?
What is the purpose of using black lifters for light powders and light lifters for black powders?
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What type of equipment can be used to make a preliminary analysis of a suspicious substance?
What type of equipment can be used to make a preliminary analysis of a suspicious substance?
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What kind of testing matrix is used in WMD crime scenes?
What kind of testing matrix is used in WMD crime scenes?
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What is the term for the unique arrangement of small lines on the palm side of each human finger?
What is the term for the unique arrangement of small lines on the palm side of each human finger?
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What type of marks can be compared to place a suspect at a crime scene?
What type of marks can be compared to place a suspect at a crime scene?
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How can laboratories determine whether skeletal remains are animal or human?
How can laboratories determine whether skeletal remains are animal or human?
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What type of evidence can be used to show where a piece of glass came from at the crime scene?
What type of evidence can be used to show where a piece of glass came from at the crime scene?
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What is the term for the graphic record of the energy patterns emitted by speech?
What is the term for the graphic record of the energy patterns emitted by speech?
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What type of evidence can be examined and compared, including prescription eyeglasses and broken buttons?
What type of evidence can be examined and compared, including prescription eyeglasses and broken buttons?
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What is the term for the study of the mental processes involved in comprehending, producing and acquiring language?
What is the term for the study of the mental processes involved in comprehending, producing and acquiring language?
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What type of examination is based on the supposed individuality of teeth?
What type of examination is based on the supposed individuality of teeth?
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What type of evidence can be used to identify an automobile and offer many leads?
What type of evidence can be used to identify an automobile and offer many leads?
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What is the term for the building block of chromosomes that is individual to a specific person?
What is the term for the building block of chromosomes that is individual to a specific person?
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What is the primary concern at a WMD crime scene?
What is the primary concern at a WMD crime scene?
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What should investigators learn to read to provide valuable leads?
What should investigators learn to read to provide valuable leads?
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What is the purpose of using digital fingerprinting?
What is the purpose of using digital fingerprinting?
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What is the primary challenge in handling digital evidence?
What is the primary challenge in handling digital evidence?
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What is the term for the analysis of a person's state-of-mind based on their spoken words?
What is the term for the analysis of a person's state-of-mind based on their spoken words?
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What is a concern for investigators handling body secretions?
What is a concern for investigators handling body secretions?
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What is the recommended approach to handling a cell phone as digital evidence?
What is the recommended approach to handling a cell phone as digital evidence?
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What precautions should investigators take when collecting blood evidence?
What precautions should investigators take when collecting blood evidence?
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What is the minimum number of matchable characteristics required for positive identification of a fingerprint?
What is the minimum number of matchable characteristics required for positive identification of a fingerprint?
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What should be done with evidence that is no longer needed?
What should be done with evidence that is no longer needed?
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When can evidence disposal occur?
When can evidence disposal occur?
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What is the advantage of DNA testing in high-volume crimes?
What is the advantage of DNA testing in high-volume crimes?
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What type of DNA is used in forensic analyses?
What type of DNA is used in forensic analyses?
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Why are plastic containers not recommended for storing DNA samples?
Why are plastic containers not recommended for storing DNA samples?
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What is the limitation of Y-STR analysis?
What is the limitation of Y-STR analysis?
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What is the purpose of Biogeographical ancestry DNA testing?
What is the purpose of Biogeographical ancestry DNA testing?
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What is the purpose of the Combined DNA Index System (CODIS)?
What is the purpose of the Combined DNA Index System (CODIS)?
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What is the significance of the number of DNA profiles in the NDIS forensic index?
What is the significance of the number of DNA profiles in the NDIS forensic index?
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What is the significance of DNA evidence in court?
What is the significance of DNA evidence in court?
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What is the significance of the Innocence Project?
What is the significance of the Innocence Project?
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Study Notes
Forensics and Physical Evidence
- Forensic science is the application of scientific processes to solve legal problems within the context of the criminal justice system.
Types of Evidence
- Best evidence: original evidence
- Physical evidence: anything real that helps establish facts of a case
- Direct evidence: establishes proof of a fact without other evidence
- Indirect evidence (circumstantial evidence): tends to incriminate a person
- Trace evidence: extremely small items (e.g., hair, fibers)
- Prima facie evidence: established by law
- Associative evidence: links a suspect with a crime (e.g., fingerprints, footprints)
- Corpus delicti evidence: establishes that a crime has been committed
- Probative evidence: vital to an investigation or prosecution
- Material evidence: forms a substantive part of a case
- Relevant evidence: applies to the matter in question
- Competent evidence: properly collected, identified, filed, and secured
Crime Scene Investigators
- CSI develops, processes, and packages physical evidence, attends and documents autopsies, and writes reports and testifies in court
- CSI effect: a phenomenon where TV shows create an unrealistic image of forensic science
- Tech effect: public awareness of modern technology influencing juror expectations
Investigative Equipment
- Equipment needed for each investigation varies
- Examples of equipment: cameras, chalk, containers, fingerprint kit, labels, magnifiers, measuring tape, notebooks, pens
- Selecting equipment: work with other organizations, identify what's needed, and select suitable equipment
- Equipment containers: store equipment carefully to maintain its condition
- Transporting equipment: use professional containers and equipment to create a consistent image
Crime Scene Integrity and Contamination of Evidence
- Value of evidence affected by what happens immediately following the crime
- Cordon off the crime scene to maintain integrity
- Document chain of evidence (chain of custody) to ensure admissibility in court
- Recall Locard's principle of exchange: collecting evidence can result in contamination
Processing Evidence: Maintaining the Chain of Custody
- Discovering or recognizing evidence: consider the type and nature of the crime, and examine the area carefully
- Marking, identifying, and collecting evidence: mark or identify each item, record date and time, and specify case number
- Packaging and preserving evidence: package each item separately to maintain integrity
- Transporting evidence: use legal ways to transport, specify signature upon receipt
- Protecting and storing evidence: store securely, free from pests, insects, and excessive heat or moisture
- Exhibiting evidence in court: ensure admissibility, identify evidence, describe where found, establish custody, and explain any changes
Frequently Examined Evidence
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Fingerprints: unique arrangement of friction ridges on fingertips
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Types of fingerprints:
- Latent prints: not readily seen, developed through powders or chemicals
- Visible fingerprints: made when fingers are dirty or stained
- Plastic fingerprints: impressions left in soft substances
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Fingerprint analysis:
- Elimination prints: identify whose prints belong at the scene
- Inked prints: standard procedure for arrested adults
- Digital fingerprinting: advances in computer technology
- Fingerprint patterns, analysis, and identification: arched, looped, or whorled
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Voiceprints: graphic record of energy patterns emitted by speech
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Language analysis: captures spoken language, can reveal speaker's state-of-mind
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DNA profiling: uses genetic code to positively identify a person
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Human DNA profiling:
- Uses material from chromosomes to identify individuals
- Can be used to solve high-volume crimes
- Identifying, collecting, and preserving DNA evidence
- DNA testing: two types of DNA (nDNA and mtDNA)
- Challenges with mixed profile samples
- Y-STR analysis: uses Y chromosome as a male-specific identifier### DNA and Forensic Science
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The year-end backlog of offender DNA samples has increased steadily from 657,166 in 2007 to 952,393 in 2009.
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DNA can identify a criminal with near absolute certainty or exonerate innocent suspects.
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325 people had been exonerated through DNA testing as of the time the text went to print.
Evidence Types
- Blood and other body fluids, including semen and urine, can provide valuable information.
- Semen and saliva may be detected with fluorescent lights (FLS), and blood trails or blood "spatter" can also be useful as evidence.
- Scent can establish probable cause for an arrest.
- Hairs and fibers can place an individual at the crime scene.
- Secondary ion mass spectrometry (SIMS) chemicals can distinguish trace hair samples using consumer chemicals as identifiers.
- Shoe and tire impressions can be specific to the shoe or tire.
- Bite marks can be found on the suspect or victim's body or on anything else placed in the mouth.
- Bite mark identification is based on the "supposed" individuality of teeth and is legally admissible in court.
- Teeth may also be an excellent source of genomic DNA.
Forensic Tools and Techniques
- Tools and tool marks can be traced if broken parts are left behind or by marks caused by the use of the tool.
- Firearms and ammunition can be analyzed through gunpowder tests, shot pattern tests, and functional tests of a weapon.
- Glass can be used for transfer of evidence and to show where a piece of glass came from at the crime scene.
- The Glass Evidence Reference Database contains more than 700 glass samples from manufacturers, distributors, and vehicle junkyards.
- Soils and minerals can place a suspect at a crime scene.
- Safe insulation can transfer to the suspect's clothing.
- Ropes, strings, and tapes can be compared, either by type or the cut ends.
- Drug identification kits can be used to make a preliminary analysis of a suspicious substance.
- Typing, handwriting, and printing can be compared.
- The Forensic Information System for Handwriting (FISH) is a database maintained by the U.S. Secret Service.
- Laundry and dry-cleaning marks can be used for comparisons and to find the business.
- Paint colors and samples can lead to the identification of an automobile.
- Digital evidence requires special handling and analysis.
Digital Evidence
- The digital revolution has generated a new class of evidence and requirements for handling it.
- The absence of geographic boundaries and the question of jurisdiction are challenges in electronic crimes.
- Cell phones can provide valuable evidence, including subscriber information, call-detail records, and GPS data.
- Only a person with training should analyze a cell phone.
- All cell phones leave a trail.
- Global positioning system chips built into cell phones allow authorities to track criminals as well as people in need of help.
Other Types of Evidence
- Weapons of mass destruction (WMDs) include nuclear weapons, radiological, biological or chemical agents, and explosives.
- Skeletal remains can be analyzed to determine whether they are animal or human.
- Dental comparisons and X-rays of old fractures are other important identifying features or individual characteristics.
- Wood comparisons are possible regarding the type of wood and origin.
- Prescription eyeglasses, broken buttons, glove prints, and other personal evidence found at a crime scene can also be examined and compared.
- Investigators should learn to read "product DNA," the printed code that appears on nearly every manufactured, mass-produced item.
Evidence Handling and Infectious Disease
- Consider all body secretions as potential health hazards.
- AIDS is not spread through casual contact such as touching an infected person or sharing equipment.
- Tuberculosis (TB) is of greater concern.
- MRSA is a staph infection that is resistant to most antibiotics and is very infectious, severe, and sometimes deadly.
- Use "universal precautions" when collecting blood evidence and other bodily fluids.
- Wash hands thoroughly with soap and water.
- Be alert for sharp objects, such as hypodermic needles and syringes, while processing the crime scene.
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Description
This quiz covers the concepts of forensics, physical evidence, crime scene investigation, and evidence processing in criminal investigations. It is based on Chapter 5 of the 11th Edition of Criminal Investigation by Hess, Orthman, and Cho.