1. Take out your notes – we are going to lecture on Ch. 2.  Be sure to turn in your Ch. 2 HW! While you are waiting, respond to the following: 1. What is physical evidence? 2. When police are called to a crime scene, what are the first few things they should do? Tues, 9/30

2. Ch. 2 The Crime Scene

3. CHE 113 3 Processing the Crime Scene 1. 1 st officer on the scene 2. Surveying the crime scene 3. Documenting the crime scene 4. Searching the crime scene 5. Collecting physical evidence

4. CHE 113 4 1. First officer on the scene 1. Check for immediate safety concerns 2. Assist the victim 3. Search for/arrest suspect 4. Detain and separate witnesses 5. Protect the crime scene (barrier tape) Limit entry to scene to necessary personnel Limit entry to scene to necessary personnel 6. Note any changes made to the scene

5. CHE 113 5 2. Crime scene survey Things to consider when defining the crime scene:  Location of Criminal Activity  Primary crime scene: Where the original crime occurred  Secondary crime scene: Subsequent crime scenes  Example: Where body was dumped  Size of Area  Type of Crime Committed  Robbery, homicide, sexual assault. Etc.  Physical Location of the Crime  Indoors/outdoors, apartment, vehicle. Etc.

6. CHE 113 6 The Preliminary Exam A lead investigator will start the process of evaluating the area. A lead investigator will start the process of evaluating the area. First, the boundaries of the scene must be determined First, the boundaries of the scene must be determined Followed by the establishment of the perpetrator ’ s path of entry and exit. Followed by the establishment of the perpetrator ’ s path of entry and exit. The investigator then proceeds with an initial walk- through of the scene to gain an overview of the situation and develop a strategy for the systematic examination and documentation of the entire crime scene. The investigator then proceeds with an initial walk- through of the scene to gain an overview of the situation and develop a strategy for the systematic examination and documentation of the entire crime scene. Search pattern determined Search pattern determined This is done before processing the crime scene for physical evidence. This is done before processing the crime scene for physical evidence.

7. CHE 113 7 Information Gathered From the Crime Scene Corpus Delicti: the body of the offense Corpus Delicti: the body of the offense Must prove a crime has been committed Must prove a crime has been committed Ex: dead body should be found in murder trial Ex: dead body should be found in murder trial Modus Operandi (MO): a certain criminal’s repeated behavior Modus Operandi (MO): a certain criminal’s repeated behavior Linkages of persons, places, and things Linkages of persons, places, and things Prove or disprove witness statements Prove or disprove witness statements Identification of potential suspects Identification of potential suspects Provide investigative leads Provide investigative leads Crime Scene Reconstruction

8. CHE 113 8 3. Documenting the crime scene CSIs only have a short time to work with the scene in an untouched state CSIs only have a short time to work with the scene in an untouched state Notes, photographs, and sketches (sometimes video) are taken at every crime scene Notes, photographs, and sketches (sometimes video) are taken at every crime scene Note taking must be a constant activity throughout the processing of the crime scene. Note taking must be a constant activity throughout the processing of the crime scene. Notes must include: Notes must include: Detailed description of the scene with the location of items of physical evidence recovered. Detailed description of the scene with the location of items of physical evidence recovered. For each piece of evidence discovered: For each piece of evidence discovered: Time it was found Time it was found Who found it Who found it Notes on its condition when found Notes on its condition when found How and by whom it was packaged and marked How and by whom it was packaged and marked The disposition of the item after it was collected The disposition of the item after it was collected

9. CHE 113 9 Personnel Duties and Responsibilities Photographer and Photographic Log Recorder Photographer and Photographic Log Recorder Photograph entire scene (before and after entered) Photograph entire scene (before and after entered) Photograph victim, crowd, vehicles Photograph victim, crowd, vehicles Photograph evidence before it ’ s moved (including fingerprints, casts, etc.) Photograph evidence before it ’ s moved (including fingerprints, casts, etc.) Photograph evidence both in wide view (position at scene) and close-up (with scale) Photograph evidence both in wide view (position at scene) and close-up (with scale) Possible use of video recording (does not replace still photography Possible use of video recording (does not replace still photography Prepare photographic log Prepare photographic log

10. CHE 113 10 Capture Crime Scene

11. CHE 113 11 Wide angle lenses are used to distort the truth or emphasize it

12. CHE 113 12 Details preserved

13. CHE 113 13 Personnel Duties and Responsibilities Sketch Preparer Sketch Preparer Diagram area of scene (incl. orientation) Diagram area of scene (incl. orientation) Rough sketch – reasonably accurate dimensions, orientation and location of evidence (from a fixed point) Rough sketch – reasonably accurate dimensions, orientation and location of evidence (from a fixed point) Finished sketch - aesthetic appearance, drawn to scale (usually done later sometime w/ CAD) Finished sketch - aesthetic appearance, drawn to scale (usually done later sometime w/ CAD) Set forth major items of evidence on sketch (with scale) Set forth major items of evidence on sketch (with scale) Make measurements (double check) Make measurements (double check)

14. CHE 113 14 Sketch Preparer Sketch Preparer Rough Sketches

15. CHE 113 15 Sketch Preparer Sketch Preparer Finished Sketches

16. CHE 113 16 Sketch Preparer Sketch Preparer

17. CHE 113 17 Creating A Finished Sketch Read instructions as a class Read instructions as a class Discuss differences between a rough and a finished sketch Discuss differences between a rough and a finished sketch Time to work (you will have tomorrow as well) Time to work (you will have tomorrow as well) Leave your work thus far in the in folder unless you are sure you won’t lose it! Leave your work thus far in the in folder unless you are sure you won’t lose it!