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Introductory Unit 2
Question | Answer |
---|---|
How are facial composites used? | Investigators work with sketch artists and eyewitnesses to create facial composites, or sketches of a person's face. |
In what ways can facial composites be used? | Internally, to assist officers in identifying the suspect. Externally, through local media (radio, TV, and newspaper) to solicit leads from citizens. |
FACES | A software program that offers many options to help you recreate a person's facial features. |
What are the crime scene and suspect factors? | Face chacteristics, time of day, trauma, and time given to focus on a perpetrator's face. |
Witness factors: drugs | Drugs can alter a person's ability to recall the events of a crime. |
Witness factors: other people | Other witnesses, investigators, and/or media can influence a person's memory. |
Witness factors: age | Age can play a role in the accuracy of eyewitness' statement. |
Witness factors: race | The Cross Race Effect (CRE) is a phenomenon in which people are better at recognizing faces of their own race rather than those of other races. |
What percent of convictions are overturned on DNA edidence when eyewitness misidentification played a major role? | Eyewitness misdientification played a role in wrongful convictions in more than 75% of convictions overturned through DNA testing. |
What is the first step to handling a crime scene? | Interview- interview the first officer at the scene or the victim to determine what allegedly happened, what crime, and how it was committed. |
What is the second step to handling a crime scene? | Examine- helps identify possible evidence, identify the point of entry and point of exit, and outline the general layout of the crime scene. |
What is the third step to handling a crime scene? | Document- involves creating a pictorial record of the scene as well as a rough sketch to demonstrate the layout of the crime scene. |
What is the final step to handling a crime scene? | Process- the crime scene technician will process the crime scene for evidence, both physical and testimonial evidence. |
What is studied in the physical science unit? | Chemistry, physics, and geology. (ex: drugs, glass, paint, explosives, and soil) |
What is studied in the biology unit? | DNA/dried blood, other body fluids (semen, stomach acids), hair, fibers, plants/wood |
Pathologist | Studies cellular changes/various aspects of disease. |
Serologist | Studies blood groups and other bodily fluids |
Entomologist | Studies insects and decomposition |
Anthropologist | Studies bones to determine a person's identity |
Odontologist | Examines the patterns of bite marks and makes the casts of bite marks |
What is studied in the firearms unit? | Firearms, discharged bullets, cartride cases, shotgun shells, ammunition, gun shot residues, and distances to target. |
Ballistics expert | Studies everything to do with firearms. |
Document examination | Studies handwriting validity, typing validity, analysis of paper/ink, and indented writing. |
What is involved in the photography unit? | Photographs of evidence/scenes, digital imagery, infrared (heat), ultraviolet, x-rays, and prepares photograph exhibits for court. |
What is the study of toxicology? | Detection of poisons or drugs. |
Latent fingerprint | Latent- invisible to the naked eye. Collecting, processing, and examining fingerprints. |
Dactyloscopy | The study of fingerprints. |
Polygraph | Lie detector examination and interpretation. |
What is studied in a voiceprint analysis? | Records and interprets sound which is transformed from speech to visual displays. |
Linguists | Studies written and oral communication to identify the speaker. |
Evidence collection | Collects and preserves physical evidence to be processed. |
Crime scene photographer | AKA identification officer or ID technician. |
Forensic psychologist | Develops psychological profile of the criminal |
Forensic artist | Draws the likeness of the person based solely on an eyewitness description or aging photograph. |
Forensic sculptor | Reconstructs with modeling clay the appearance of the face based from the structure of the skull. |
Forensic engineer | Concerned with failure analysis, accident reconstruction and causes and origins of fires or explosives. |