They take photographs and physical measurements of the scene, identify and collect forensic evidence, and maintain the proper chain of custody of that evidence. Crime scene investigators collect evidence such as fingerprints, footprints, tire tracks, blood and other body fluids, hairs, fibers and fire debris.
What are the 5 steps in a crime scene investigation?
The basic crime scene procedures are physical evidence recognition, documentation, proper collection, packaging, preser- vation, and, finally, scene reconstruction.
What are the 7 basic steps in crime scene investigation?
What are the seven steps of a crime scene investigation?
- Identify Scene Dimensions. Locate the focal point of the scene.
- Establish Security. Tape around the perimeter.
- Create a Plan & Communicate.
- Conduct Primary Survey.
- Document and Process Scene.
- Conduct Secondary Survey.
- Record and Preserve Evidence.
What are the 6 steps in crime scene investigation?
Basic Stages for a Crime Scene Investigation — Possible Homicide
- Approach the Scene.
- Secure and Protect the Scene.
- Initiate Preliminary Survey.
- Evaluate Physical Evidence Possibilities.
- Prepare a Narrative of the Scene.
- Capture the Scene Photographically.
- Prepare the Crime Scene Sketch.
- Conduct a Detailed Search.
What are the steps in crime scene processing?
Basic Stages in a Search
- Approach scene Secure and protect scene.
- Initiate preliminary survey/determine scene boundaries.
- Evaluate physical evidence possibilities.
- Prepare narrative description.
- Depict scene photographically.
- Prepare diagram/sketch of scene.
- Conduct detailed search.
- Record and collect physical evidence.
What is the process of an investigation?
The investigative process is a progression of activities or steps moving from evidence gathering tasks, to information analysis, to theory development and validation, to forming reasonable ground to believe, and finally to the arrest and charge of a suspect.
What are 4 steps to crime scene protocol?
Whether the crime scene is a recovered stolen vehicle or a multiple homicide where several crime scenes are involved the basic protocol is the same: INTERVIEW, EXAMINE, PHOTOGRAPH, SKETCH and PROCESS.
How are fingerprints collected at a crime scene?
When a crime is committed, crime scene investigators typically use adhesive powders to find fingerprints. The powder sticks to the oils present in fresh fingerprints, making them visible. After locating a print, crime scene investigators photograph the print and lift using special lifting tape.
How are drugs collected at a crime scene?
Often drugs are smuggled inside the body using plastic bags or other small soft containers that fit into cavities or can be swallowed and regurgitated.
What are the 7 S’s in order?
These are known as the 7 S’s of crime scene investigation.
- Secure the Scene.
- Separate the Witnesses.
- Scan the Scene.
- See the Scene.
- Sketch the Scene.
- Search for Evidence.
- Secure and Collect Evidence.
Which step is done first when processing a crime scene?
Interview is the first step in processing a crime scene. The crime scene technician must interview the first officer at the scene or the victim to ascertain the “theory” of the case. Basically what allegedly happened, what crime took place, and how was the crime committed.
How is evidence collected at a crime scene?
Prioritize the order of evidence collection. Collect large items first and then proceed to the trace evidence. USE CAUTION WHEN WALKING THE CRIME SCENE. Once the trace evidence is collected via vacuuming, taping, or tweezing, take blood samples, remove bullets, dust for fingerprints, and so on.
What are the 4 search patterns for crime scenes?
Types of Crime Scene Searches Common search patterns include the spiral, strip/line, grid, zone/quadrant, and pie/ wheel.
What is a crime scene investigation?
The purpose of crime scene investigation is to help establish what happened (crime scene reconstruction) and to identify the responsible person. This is done by carefully documenting the conditions at a crime scene and recognizing all relevant physical evidence.
What are the steps in conducting an investigation?
- Decide whether to investigate.
- Take immediate action, if necessary.
- Choose an investigator.
- Plan the investigation.
- Conduct interviews.
- Gather documents and other evidence.
- Evaluate the evidence.
- Take action.