What are the six signs of arson?
Common Signs of Arson
- 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.
What is considered an accidental fire?
Typical causes of accidental fires are cooking accidents, overheated or short circuited electrical connections, spontaneous combustion of oils, welding sparks, burst gas lines, sparks from fireplaces, lightning, cigarette butts, left-on appliances, reacting chemicals. The list of all the possible causes is very long.
What are the 4 key elements of fire investigation?
With few exceptions, the proper methodology for a fire or explosion investigation is to first determine and establish the origin(s), then investigate the cause: circumstances, conditions, or agencies that brought the ignition source, fuel, and oxidant together.
What is the first step in fire investigation?
The first step in a fire investigation is the preliminary scene examination/size-up. For best results, a trained fire investigator should be notified about and respond to serious fires or possible arson fires immediately after fire apparatus is dispatched.
What are the steps to 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.
How would you collect evidence of arson?
Arson evidence is usually collected in air-tight, clean metal cans. Only large quantities of dry powder should be collected and stored in plastic bags. Moist or wet evidence (blood, plants, etc.)
What is the last step in completing an arson investigation?
The steps listed are: arriving at the scene, evaluating the scene, documenting the scene, processing evidence at the scene, and finally completing the investigation (National Institute of Justice 2009).
What is evidence of arson?
There are many physical clues that may suggest arson is a fire cause. They include: Burn pattern: multiple origins or unusual origin location. Presence/absence, and/or condition of ignition key. Ignition lock/switch condition.
What methods are used to analyzed evidence of explosion?
Many methods such as chromatography-mass spectrometry, scanning electron microscopy, stereomicroscopy, capillary electrophoresis are available for use in the identification of explosive residues on objects and bomb fragments.
What are two types of high explosives?
Detonating explosives, such as TNT and dynamite, are characterized by extremely rapid decomposition and development of high pressure, whereas deflagrating explosives, such as black and smokeless powders, involve merely fast burning and produce relatively low pressures.
What may be rinsed over materials to wash off explosive residue?
acetone
What is impression evidence?
Impression evidence is created when two objects come in contact with enough force to cause an “impression.” Typically impression evidence is either two-dimensional — such as a fingerprint — or three-dimensional — such as the marks on a bullet caused by the barrel of a firearm.
What are the 5 types of impression evidence?
- Types Impression Evidence.
- Shoe Impressions.
- Historical Case.
- Use Caution.
- Preservation and Documentation.
- Tire Impressions.
- Glove Prints.
- Tool Mark Impressions.
What are examples of impression evidence?
Impressions are created when one object is pressed against another material with enough force to leave an impression of the object. Shoeprints, tool marks, tire tracks, bite marks, and marks on a fired bullet are several examples of impression evidence.
What are the five types of impression evidence?
The major types of impression evidence are shoeprints, tire tracks , tool marks and the marks that are found on a fired bullet. Impressions can be found in a variety of surfaces including dust, carpet, mud, and, very significantly, blood .
What are 3 categories of impressions?
Impressions fall into three basic categories: patent, latent, and plastic.
What is the best way to document impression evidence?
ression evidence can be accomplished using several methods: n can be documented using photography as well as by casting, wh or a similar substance to preserve the dimensional characteristics of the print.
What are the 3 types of impression?
Evidence that May be Examined Prints are divided into three types: visible, plastic and latent. A visible print is a transfer of material from the shoe or tire to the surface.