When searching a crime scene for trace evidence, investigators typically follow a geometric pattern (see the following figure). They may use a crisscrossing grid, a shoulder-to-shoulder linear pattern, or expanding or contracting spiral patterns.
Who searches for evidence at a crime scene?
Crime scene investigators document the crime scene. They take photographs and physical measurements of the scene, identify and collect forensic evidence, and maintain the proper chain of custody of that evidence.
What are the four methods of crime scene search?
Following are the basic search methods, usually commissioned on the crime scene:
- Zonal Method.
- Strip Method.
- Line Search.
- Grid Method.
- Spiral Method (Outward Spiral & Inward Spiral)
- Wheel Search Method.
- Random Search.
What are the methods of crime scene search?
Most commonly employed search methods are geometric patterns. The six patterns are link, line or strip, grid, zone, wheel or ray, and spiral. Each has advantages and disadvantages and some are better suited for outside or indoor crime scenes.
How are crime scenes investigated?
Photograph and document the scene. Collect trace materials (especially from probable points of entry) Collect low-level DNA evidence by swabbing areas of likely contact. Collect other items that may contain biological evidence.
What are the 3 phases of criminal investigation?
Applied to the criminal realm, a criminal investigation refers to the process of collecting information (or evidence) about a crime in order to: (1) determine if a crime has been committed; (2) identify the perpetrator; (3) apprehend the perpetrator; and (4) provide evidence to support a conviction in court.
What are the 5 steps of crime scene investigation?
INTERVIEW, EXAMINE, PHOTOGRAPH, SKETCH and PROCESS.
What are the four different search methods?
Common search patterns include the spiral, strip/line, grid, zone/quadrant, and pie/ wheel. The spiral search is used most often for outdoor crime scenes, is conducted by one person, and is done by walking in a circle from the outermost point of the inner perimeter toward the center of the circle.
What is the best method of crime scene search?
The grid method is best used in large crime scenes such as fields or woods. Several searchers, or a line of them, move alongside each other from one end of the area to be searched to the other.
What is the grid method in crime scene?
Grid method. -Large outdoor crime scenes. -Searchers follow the first line pattern then searchers realign and continue going the other way (vertical/horizontal)
What is the most important part of the crime scene?
The Body. The body is the most important piece of evidence of any death scene. Without a body, you have do not a death scene, (even if the body is presumed dead and ordered so by the courts) .
What are the steps of an investigation?
The following steps should be taken as soon as the employer receives a verbal or written complaint.
- Step 1: Ensure Confidentiality. …
- Step 2: Provide Interim Protection. …
- Step 3: Select the investigator. …
- Step 4: Create a Plan for the Investigation. …
- Step 5: Develop Interview Questions. …
- Step 6: Conduct Interviews.
What are the three types of evidence at a crime scene?
Evidence: Definition and Types
- Real evidence;
- Demonstrative evidence;
- Documentary evidence; and.
- Testimonial evidence.
What evidence does the FBI consider the most valuable?
Answer Expert Verified. The answer is DNA. There are several ways to obtain DNA samples, like blood, saliva, semen or hair. They are very important to guarantee a certified verification of the people involved with the situation and guarantee the best investigation possible of the event.