1. How are fire scenes different than regular crime scenes for investigators? …
As investigators are allowed to enter a fire scene without a warrant, they are also allowed to gather evidence at the scenes without a warrant
. This can be very important to preserving evidence and identifying suspects in the case of arson.
What are the three types of crime scenes and how are they different?
Different types of crime scenes include
outdoors, indoor, and conveyance
.
What is the difference between a crime scene and a secondary crime scene?
1. The primary crime scene is where a crime actually occurred. 2. A secondary crime scene
is in some way related to the crime but is not where the actual crime took place
.
What is the primary focus of a fire scene search and why what evidence at a fire site may indicate the possibility of arson?
What evidence at a fire site may indicate the possibility of arson? A search of the fire scene
must focus on finding the fire’s origin
, because this area will prove most productive in any search for an accelerant or ignition device.
What are the three main components of a fire scene investigation?
In order for a fire to occur, three vital components must be present:
a fuel source, an oxidant (O
2
) and a sufficient amount of energy in the form of heat
. Together these make up the fire triangle. A fourth factor can also be described – a self-sustaining chemical chain reaction – to produce the fire tetrahedron.
What are the different type of crime scenes?
- Outdoor.
- Indoor.
- Conveyance.
What are the different parts of crime scene?
These are
the pre-crime stage, the criminal event stage, and the post-crime stage
. These three stages of crime can also mean there could be other locations outside the immediately crime scene area where criminal activities might have also taken place and evidence might be found.
What factors are different in an outdoor crime scene and how can they pose problems for the investigation?
Wind, sun, rain, snow and temperature
can play key roles in the destruction of the evidence at a crime scene. For instance, if there is blood at an outdoor crime scene and it rains, the blood may become so diluted that testing of the blood becomes impossible.
What is the 1st priority at a crime scene?
the first officer to arrive is responsible for securing the crime scene. First priority is
to be given to victim if any
, obtaining medical assistant if necessary and arresting perpetrator.
What are the seven S’s of a crime scene?
- Securing the scene. First officer must secure crime scene by making sure area is safe and by preserving evidence.
- Separating witnesses. …
- Scan the scene. …
- See the scene. …
- Sketching the scene. …
- Search for evidence. …
- Securing and Collecting evidence.
What type of evidence or characteristics would be expected at a fire scene and why?
Observe and mentally note evidence at the scene, such as: Fire patterns (including multiple fire locations).
Burn injuries to victims and fire patterns on clothing
. Trailers, ignitable liquids or other unusual fuel distribution (e.g., piles of newspapers and/or furniture pushed together).
How is evidence from a fire scene collected?
Most items of evidence will be collected in
paper containers such as packets, envelopes, and bags
. Liquid items can be transported in non-breakable, leakproof containers. Arson evidence is usually collected in air-tight, clean metal cans. … That evidence can then be repackaged in a new, dry paper container.
What is a fire scene?
Fire scene means
the immediate area necessary for a local fire department
or the State Fire Marshal’s Office to investigate an actual fire.
What are 3 artifacts of a fire that would indicate the heat of the fire and points of origin?
The three factors are known as the fire triangle (Peige ed., 1977). The fire triangle
consists of oxygen, a fuel source, and heat
.
What are the 2 indications of arson fire?
First,
there has been a burning of property. Second, the burning is incendiary in origin
, and finally, the burning was started with the intent of destroying the property.
What are the four fire cause classifications?
There are four classifications of fire cause:
accidental, natural, incendiary, and undetermined
.
Why do criminals go back to the scene of the crime?
FIRSTLY,
the killer returns to see the investigation taking place so they know what the cops know
. They want to see if they can figure out what l, if any evidence was found or suspects. Bringing themself into the investigation is often realized after the fact as well.
Which crime scenes are most vulnerable to contamination?
The outdoor crime scene
is the most vulnerable to loss, contamination, and deleterious change of physical evidence in a relatively short period of time. Individuals with access to the scene can potentially alter, destroy or contaminate evidence.
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
.
How do you describe a crime scene in a story?
- Understand the mechanism of death. …
- Understand time of death. …
- Understand scene access. …
- Get the terminology right. …
- Crime-lab results are not so quick. …
- Don’t get creative with investigational aids. …
- Use the five senses. …
- Craft believable dialog.
How do students create a crime scene?
- Decide Where It Will Be in Your Classroom. A classroom crime scene takes up a fair amount of space in your classroom. …
- Think about Your Crime. …
- Set Up Your Clues. …
- Rope Off Your Area. …
- Introduce It to Your Students.
What are the steps in the crime scene process?
- Identify Scene Dimensions. Locate the focal point of the scene. …
- Establish Security. Tape around the perimeter. …
- Create a Plan & Communicate. Determine the type of crime that occurred. …
- Conduct Primary Survey. …
- Document and Process Scene. …
- Conduct Secondary Survey. …
- Record and Preserve Evidence.
How can crime scenes not be contaminated?
- Wear gloves and change them often.
- Use disposable instruments or clean them thoroughly before and after handling each sample.
- Avoid touching the area where DNA may exist.
- Avoid talking, sneezing, and coughing over evidence.
Why is outdoor crime scene considered the most vulnerable among all types of crime scene?
An outdoor crime scene is the most vulnerable to
loss, contamination and damaging effects on biological evidence in a short period of time
. … Destruction or deterioration of evidence due to environmental conditions, such as heat, cold, rain, snow and wind call for rapid and effective protection of biological evidence.
How can we preserve crime scenes?
- do not move anything unless absolutely necessary.
- to the extent possible, avoid contaminating evidence.
- photograph or video record the scene as well as individual objects before moving anything.
- protect forensic evidence from the elements.
Why are crime scenes so important?
The purpose of crime scene investigation is
to help establish what happened (crime scene reconstruction) and to identify the responsible person
. … The ability to recognize and properly collect physical evidence is oftentimes critical to both solving and prosecuting violent crimes.
What is done during seeing the scene?
See the Scene
A photography unit will take pictures of items identified during the initial scan
. Pictures should be taken of the overall area, as well as close-ups, using evidence markers or a ruler for size reference. Evidence markers often include a ruler or scale to show the approximate size of the object.
What are the two priorities while securing a crime scene?
First priority is the safety of all individuals. Assist or preserve the life of the victim.
document crime scene and collect evidence. assess the extent of the crime scene
.
Who sketches a crime scene?
Forensic sketch artists
work with police to interview victims or witnesses of crimes in order to recreate a semi-realistic drawing that reflects the image of the perpetrator to the best of the witness’s memory.
How are sketches helpful with crime scenes?
Why is a sketch important to crime scene documentation?
It accurately portrays the physical facts
. It relates to the sequence of events at the scene. It establishes the precise location and relationship of objects and evidence at the scene.
What are the three methods for recording a crime scene?
The three most common methods of recording a crime scene are:
note taking, sketching, and photography
.
What is fire scene investigation?
Fire and arson investigators
examine the physical attributes of a fire scene and identify and collect physical evidence from the scene
. … During the scene examination, investigators may find evidence such as accelerants, tampered utilities, and specific burn patterns, which may indicate criminal activity.
What is the difference between fire and arson?
In context|uncountable|lang=en terms the difference between fire and arson. is that
fire is (uncountable) the bullets or other projectiles fired from a gun while arson
is (uncountable) the crime of setting a fire with intent to cause damage.
How can we minimize fire?
- Create and practice a fire escape plan. Include two ways out of every room. Pick a spot to meet outside. …
- Install and maintain smoke alarms. Place smoke alarms on every level of your home, including inside and outside bedrooms. Test smoke alarms once a month.
What area of a fire scene will often contain the greatest amount of damage and debris?
the area of origin
will often contain the greatest amount of damage and debris. the debris in the area of origin will contain an indication of the fire cause, such as matches and a fuel source.
What is the better method in taking photographs of a fire scene?
a) The orientation photograph – covers the entire picture of the fire scene with all its surroundings and helps orientation in the field.
Aerial or height photographs
are recommended for an overview highlighting of the roof damage, in case of buildings.
What are the five components using a systematic approach with which fires are investigated?
as
fire patterns, direct observations, measurements, documentation such as photography, evidence collection, testing, experimentation and witness interviews
.
When collecting questioned documents from a fire scene the best practices is?
Wrap articles containing glass carefully in clean paper or
plastic bags. 3. Use a pillbox or vial to package small glass fragments and particles recovered from a suspect or scene; avoid the use of envelopes. Use tweezers or a similar tool to collect the glass.
How is blood collected at a crime scene?
Liquid blood evidence is
generally collected from blood pools but can be collected off of clothing as well
, using a gauze pad or a sterile cotton cloth. … Once the sample is collected it must be refrigerated or frozen and brought to the laboratory as quickly as possible.
What can indicate the fire was planned?
The absence of normal household items or business equipment can indicate that they were removed before the fire started.
Removal of
these items can indicate that the fire was planned. Removal of sentimental items such as baby pictures, school records and valuables can indicate a planned fire.
What is the seat of the fire?
SEAT OF THE FIRE –
The area where the main body of the fire is located
, as determined by the outward movement of heat and gases; where the fire is deep-seated.
What are some of the signs of arson that a fire fighter may notice at a fire scene?
- A large amount of damage.
- No “V” burn pattern present, unsual burn patterns and high heat stress.
- Lack of accidental causes.
- Evidence of forced entry.
- Absence of valuable items.
- The same person shows up at unconnected fires.
- Low burning point with unidentifiable point of origin.
- Multiple points of origin.
