Assignment 2 FOSC Nkosi (2)

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1 Empress Nkosi Cass D. Parker Forensic Science 20 January 2024 Survey of Forensic Science (FOSC 1101/SCI 1901F) Module 2 Assignment: 2 1. Why should bloodstained evidence not be stored in airtight containers? What is the best way to store such evidence? (3 pts) Bloodstained evidence should be stored in breathable containers or paper bags to prevent mold and bacteria growth and moisture buildup. These containers allow air to circulate, preventing damage to the evidence. This allows the evidence to stay fresh and maintain its integrity. In forensic science, choosing the right container is crucial for maintaining accurate analysis and ensuring the evidence remains as close to its original state as possible, allowing investigators to rely on it for truth- finding. 2. What is a disadvantage to the spiral search pattern? (2 pts) The spiral search pattern, a method used in crime investigations, may not be suitable for large or oddly shaped crime scenes due to its potential to skip over certain areas, leading to incomplete analysis. This is because the spiral search pattern, which starts from a central point and moves outward in a circular manner, may not reach every inch of the scene, making it difficult to identify important evidence. Therefore, investigators must choose the right method based on the specific characteristics of the crime scene. 3. What are the three most basic methods of crime scene recording? (3 pts)

2 Crime scene recording methods include photography, sketches, and notes. Notes should include the investigator's identity, time of contact, preliminary case information, and personnel present. Digital photographs help reconstruct crime scenes by capturing pixels in chronological order, preserving details. Videotaping should include overview, medium range, and close-up images. Body-worn cameras are useful for cases with conflicting eyewitness accounts. Sketching is crucial for detectives to capture important details, understand what happened, and make it easier for investigators, lawyers, and jurors to understand. With advancements in technology, sketching crime scenes has become even more accurate and reliable. 4. A forensic scientist generally classifies evidence into known reference samples and questions samples or samples of unknown origin. Comparisons are then made between the unknown samples and the reference samples. A forensic scientist may then be able to suggest the source of the unknown samples. Read the case file and list five unknown (questioned) samples and five known (reference) samples that you think should be collected. State what should be used to package each sample. (12 pts) Unknown (Questioned) Sample Packaging Material(s) 1.Blood trail between garage and trash can Cotton swabs or sterile gauze pads, placed in a breathable container. 2.Blood on walls in the lounge room Swabs or sterile gauze pads, placed in a breathable container.

3 3.Pool of blood on the kitchen floor Clean, airtight container to prevent spillage. 4.Diffuse red-brown stain in the kitchen sink Sterile container to preserve the stain. 5.Blood on door handles and front porch light switch Cotton swabs or sterile gauze pads, placed in separate breathable containers. Known (Reference) Sample Packaging Material(s) 1. John Douglas's blood from the recent laceration Sterile vial or container. 2. Blood and dirt on the back and underside of John's truck Sterile containers to collect samples from different areas. 3. Blood-stained clothing from John's backpack Airtight bags to prevent contamination. 4. Blood smear on the driver’s side footwell Sterile swabs or gauze pads, placed in a breathable container. 5. 10mL vial of blood containing EDTA Sterile vial to preserve the integrity of the blood sample containing EDTA. Palm City, FL - July 18th, 2002 - 8:20 P.M.

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4 Missing Person Report On July 18th 2002, Bill Brown reported his daughter Jane Douglas missing. Jane’s parents Bill and Betty Brown were minding Jane’s four children, Emma, Gemma, Bud and Bob over the weekend. On their return to Jane’s house in Palm City, Bill and Betty noticed that Jane’s car was not in the garage and Jane was not home. There was a blood trail between the garage and the trashcan and between the trashcan and the back door. The back door was open. On entering the house, a trail of footprints led from the kitchen to the lounge room towards the front door. There was blood on the walls in the lounge room and a pool of blood on the kitchen floor.

5 There was a diffuse red brown stain in the kitchen sink. There was blood on a number of door handles in the house and on the front porch light switch. John Douglas, the children’s biological father, has been separated from his wife the past 12 months. Facts Obtained from Police Record of Interview with John Douglas Allegedly, John last spoke to Jane two weeks ago. He has not seen her since. He was aware that his children would be staying with their maternal grandparents for the weekend as he was away on a hunting trip with friends. Police observed that John’s truck in the driveway had blood and dirt on the back and underside of the vehicle. John agreed to allow police to examine his truck further and he also consented to a medical examination. Crime Scene Examination of John Douglas's Truck A number of hunting knives and a rifle were recovered from the bed of the truck. A backpack containing blood stained clothing, ropes, and several large bloodstains on the back of the truck were present. A large smear of blood was in the driver’s side footwell and a smear of blood was on the steering wheel. Medical Examination of John Douglas John has a recent laceration to his left hand, which he allegedly received while skinning a deer. A 10mL vial of blood containing EDTA was collected from John Douglas. John Douglas's Explanation for the Blood in the Truck He shot and skinned a large deer and placed the carcass in the bed of the truck. The blood on his clothing is from the deer and the injury to his hand.

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