TSA - Forensic Technology Latest Update Graded A

TSA - Forensic Technology Latest Update Graded A Passive Stains Transfer Stains object coming in contact with existing blood stains and leaving wipes, smears, or pattern transfers Impact Stains blood projecting through air and usually seen as splatters. (May also include gushes, splashes, and arterial spurts.) Gunshot Splatter Includes forward splatter from exit wound and back splatter from entrance wound. Typically: Forward is a fine mist and the back is larger, fewer drops. Cast-Off Results when an object sung in arc flings blood onto nearby surfaces. Tail points in direction of motion and the number of arcs can show minimum number of blows. Arterial Spray Spurt of blood when a major artery is severed with new pattern created each time the heart pumps Expired Splatter blood from an internal injury mixing with air from lungs being expelled through the nose, mouth, or an injury to airways or lungs, forms a very fine mist and some blood stains are latent. Sharp Force Injuries (Stabbing) Less blood being deposited on the instrument, smaller more linear patterns of stains Blunt Force Injuries (Hitting or Beating) larger surface area will collect more blood, producing drops of various sizes. Transient Evidence Temporary evidence, is expected to degrade after a period of time. ex. odors, temperature, footprints Exsanguination Bleeding to death Altor Mortis Cooling of body after death Lividity Discoloration of the body after death. Takes minutes to an hour. Lasts for 36 hours. Rigor Mortis Stiffening of a body after death. It takes about 4 hours after death Classified as Traumatic Death Suicidal, Homicidal, Accidental 5 Manners of Death Natural, Accidental, Homicidal, Suicidal, Undetermined Number of permanent teeth found in a typical human mouth 32 Pathology Field that studies disease, disease causes, and diagnosis of disease The Primary Duty of a forensic expert in a court of law To Tell the Truth. They have Legal Obligations to which they must conform their conduct what Forensic Science is often called Public Science What the Term "Forensics" means Related to public or legal matters Coroner An Official who investigates sudden, violent, or suspicious death Degree of Scientific certainty the measurement of a conclusion drawn from scientific data gross examination deals only with what is visible to the unaided eye Hair Cutting Contains Mitochondria DNA circumstantial evidence evidence that relies on an inference to connect it to a conclusion of fact—like a fingerprint at the scene of a crime. By contrast, direct evidence supports the truth of an assertion directly—i.e., without need for any additional evidence or inference. Chromotography method used by scientists for separating organic and inorganic compounds so that they can be analyzed and studied Retention Factor (Rf) The retention factor of a particular material is the ratio of the distance the spot moved above the origin to the distance the solvent front moved above the origin. What protein Is hair primarily made of Keratin How many ridges does the average human adult have on one finger 150 What causes fingerprint ridge patterns Amount and location of volmer pads in thick skin What insect is usually the first to come in contact with a dead body Blow flies What percentage of the population has arched fingertips 5% What are looped finger prints? 70% of population has it What are whorl finger prints? A fingerprint pattern that resembles a bull's-eye. 25% of population has it How is DNA replicated in a laboratory Using a polymerase chain reaction (PCR) sequence What are the two primary categories of fibers Natural and synthetic How to know if someone has been exposed to Carbon Monoxide. The victim would probably be dead. The skin would be pale or pink with the lips being bright red. Symptoms include headaches, weakness, vomiting, confusion, and loss of consciousness. How can someone get a toxin? Ingestion, Inhaled, or Absorbed through skin. What do luminols do? Locates blood in a crime scene even if it is cleaned up. Who is Hai Duan Yu? He wrote the first known book on Forensic Medicine autopsy. What does GSR stand for? Gun Shot Residue What are preservatives used for? To prevent bacterial or fungal growth.