The Crime Scene bsapp.com.

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Once the scene has been secured, a lead investigator will start processing the crime scene area.

Presentation transcript:

The Crime Scene bsapp.com

Remember Locard’s Exchange Principle… When a person comes in contact with an object or another person, a cross transfer of physical evidence can occur.

Power of Observation A man is on trial for robbing a convenience store and several witnesses report seeing him at the scene. During the trial, the defense sets up an experiment to discredit the eye-witness testimony. Watch the following and count the number of times the team in white passes the ball the each other.. https://www.youtube.com/watch?v=IGQmdoK_ZfY

Approaching a Crime Scene bsapp.com

Approaching a Crime Scene Personal Safety and the well being of victims Preserve and Isolate the crime scene Record the crime scene bsapp.com

Recording the Crime Scene Photographs Sketches Notes bsapp.com

Rough Sketch to Final bsapp.com

Notes Match to sketch Use a key Quick, short, bulleted What can you not see from the photo? bsapp.com

Photography Evidence Scene Close ups Perspectives Multiple angles Multiple views Entrances Exits Windows bsapp.com

Review… What are the 3 things an investigator does when he/she comes to the crime scene? What are 3 ways they record the crime scene?

Spot the Difference Photography is an essential part of crime scene processing. A crime scene investigator may take several hundred, or even thousand photographs at a crime scene. The photos can provide key evidence as to the placement of certain pieces of evidence and their appearances before analysis. In addition, the photographs establish a chronology of how the crime scene was processed. You’ve discovered a problem with the crime scene photos from a recent case. Someone has tampered with the crime scene. See how many differences you can spot between the two photographs at the same crime scene. CSI: THE EXPERIENCE — Web Adventures

Crime Scene Photography The purpose of a crime scene photography is to give a documented record of the scene as it is observed. Everything must be photographed, including overview shots of the entire scene, mid range pictures of important objects in context, and close-up shots of every piece of evidence In court the photographer testifies about the pictures, explaining to the jury their relevance to the case and pointing out the important parts of each photograph. \ This testimony can occur weeks, months or even years after the photo were taken. It is important for crime scene investigators to have a keen sense of observation and a very strong memory. CSI: The Experience - Web Adventures | Online Activities

Collecting Evidence Victim's clothing Fingernail scrapings Head and pubic hairs Blood (for typing purposes) bsapp.com

Vaginal, anal, and oral swabs Recovered bullets from the body and/or surrounding area Hand swabs or washings from shooting victims bsapp.com

Collecting Evidence Bag & Tag bsapp.com

Collecting Controls Prints DNA Samples Hair Other evidence from possible suspects or victims for comparison to evidence bsapp.com

Collecting Controls Do You Need a Warrant? bsapp.com