Fire Investigation and Science Basics
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1
What is the primary objective of a fire investigation?
To determine the fire's origin, evaluate its cause, document relevant evidence, and establish whether a criminal offense occurred.
2
What is the difference between the origin and cause of a fire?
Origin identifies where the fire began; cause identifies the circumstances or factors that brought the ignition source, fuel, and oxidizer together.
3
What is the fire triangle?
A model showing that combustion requires fuel, heat, and an oxidizing agent, commonly oxygen.
4
What is the fire tetrahedron?
A model adding a sustained chemical chain reaction to the three elements of the fire triangle.
5
What is ignition?
The initiation of combustion when conditions allow a fuel to begin burning.
6
What is an ignition source?
A source of energy capable of initiating combustion under appropriate conditions.
7
What is the first fuel ignited?
The material that initially began burning in the fire sequence.
8
What is fire load?
The quantity of combustible material in an area, often expressed in terms of its potential heat energy.
9
What is heat release rate?
The amount of thermal energy released by a fire per unit of time, commonly expressed in kilowatts or megawatts.
10
What is flashover?
A transition in a compartment fire during which exposed combustible surfaces ignite nearly simultaneously because of intense heating.
11
What is backdraft?
A potentially violent combustion event that may occur when oxygen enters a ventilation-limited environment containing accumulated combustible gases.
12
What is a ventilation-limited fire?
A fire whose burning rate is constrained primarily by the available oxygen supply.
13
What is a fuel-controlled fire?
A fire whose burning rate is primarily limited by the amount or characteristics of available combustible fuel.
14
What is fire plume?
The rising flow of hot gases and combustion products generated above a burning fuel source.
15
What is a hot gas layer in compartment fires?
A layer of heated combustion gases that accumulates near the ceiling and can influence fire spread and damage.
16
What is heat transfer by conduction?
The transfer of thermal energy through a material or between contacting materials.
17
What is heat transfer by convection?
The transfer of thermal energy through the movement of liquids or gases.
18
What is heat transfer by radiation?
The transfer of thermal energy by electromagnetic waves without requiring direct physical contact.
19
What is a fire pattern?
A visible or measurable change produced by fire effects that may assist in evaluating fire development and origin.
20
Why must fire patterns be interpreted in context?
Ventilation, fuel distribution, suppression activities, and fire development can produce similar damage patterns through different mechanisms.
21
What is a V-pattern in fire investigation?
A pattern of fire damage that may form as heat and flames rise and spread, requiring contextual interpretation rather than automatic attribution to the origin.
22
Why is the lowest point of fire damage not necessarily the point of origin?
Falling burning material, ventilation, fuel distribution, and prolonged burning can produce severe damage away from the initial ignition location.
23
What is spalling in fire-damaged concrete?
The breaking or detachment of concrete surface material, potentially caused by thermal, moisture-related, or mechanical stresses.
24
Can concrete spalling alone establish that an ignitable liquid was used?
No. Spalling has multiple possible causes and is not a reliable standalone indicator of ignitable liquid use.
25
What is an ignitable liquid?
A liquid capable of producing vapors that may ignite under appropriate conditions.
26
What is an ignitable liquid residue?
Material remaining after exposure to an ignitable liquid that may be identified through suitable forensic analysis.
27
What is the role of gas chromatography-mass spectrometry in fire debris analysis?
It helps separate and identify chemical compounds in extracts or vapors from fire debris, supporting interpretation of possible ignitable liquid residues.
28
Does laboratory detection of an ignitable liquid automatically prove arson?
No. Investigators must consider lawful sources, contamination, fire scene circumstances, and the complete evidence.
29
What is a fire debris sample?
Material collected from a fire scene for examination of residues or other characteristics relevant to the investigation.
30
Why should suspected ignitable liquid residue samples be placed in suitable vapor-tight containers?
To reduce loss of volatile compounds and contamination before laboratory examination.
31
What is a comparison or control sample in fire debris examination?
Material collected to help evaluate background substances or distinguish suspected residues from materials naturally present at the scene.
32
What is an accidental fire classification?
A determination that available evidence supports an unintended ignition without evidence establishing deliberate fire setting.
33
What is a natural fire classification?
A determination that ignition resulted from a natural event or process, such as lightning.
34
What is an incendiary fire classification?
A determination that the fire was deliberately ignited under circumstances in which the person knew it should not have been started.
35
What is an undetermined fire cause classification?
A classification used when available evidence is insufficient to establish the cause reliably.
36
Why is an undetermined classification preferable to an unsupported arson conclusion?
A defensible investigation must reflect evidentiary limitations rather than infer deliberate ignition without sufficient support.
37
What is the principal Philippine decree penalizing arson under its specified provisions?
Presidential Decree No. 1613, subject to subsequent laws and applicable provisions of the Revised Penal Code.
38
What is Republic Act No. 9514?
The Fire Code of the Philippines of 2008, governing fire safety measures, prevention, enforcement, and related requirements.
39
Which Philippine agency has principal responsibility for enforcing the Fire Code under RA 9514?
The Bureau of Fire Protection, subject to the law and its implementing rules.
40
What is the purpose of a fire safety inspection?
To assess compliance with applicable fire safety requirements and identify hazards requiring corrective action.
41
What is the significance of fire safety inspection records during an investigation?
They may establish prior conditions, reported hazards, compliance history, and relevant corrective measures.
42
Why should investigators document the status of electrical systems after a fire?
Electrical conditions may provide relevant evidence, but damage must be evaluated to distinguish possible ignition mechanisms from effects caused by the fire.
43
What is electrical arcing?
An electrical discharge through a gas or across a gap that may produce intense localized heat and damage.
44
Does finding an electrical arc mark automatically prove an electrical fire origin?
No. Arcing may occur because of fire damage, so timing, location, circuit conditions, and other evidence must be evaluated.
45
What is the purpose of examining witness accounts of smoke and flame development?
To help reconstruct the fire timeline and compare reported observations with physical evidence.
46
Scenario: Investigators discover several separate areas of burning. Does this automatically prove multiple deliberate ignitions?
No. Fire spread, falling burning materials, ventilation, and other mechanisms must be evaluated before concluding that separate ignition events occurred.
47
Scenario: A building owner recently purchased insurance before a destructive fire. Is this sufficient to classify the fire as arson?
No. Financial circumstances may be investigated as possible motive evidence but cannot substitute for proof of deliberate ignition.
48
Scenario: Firefighters ventilated a building by breaking windows. What should investigators consider when analyzing burn patterns?
Ventilation changes can alter airflow, fire growth, and damage distribution and must be included in the reconstruction.
49
Scenario: A laboratory detects gasoline-range compounds in debris from a garage. What should investigators examine before concluding arson?
Whether the compounds came from stored fuel, vehicles, ordinary garage materials, contamination, or deliberate use, together with the remaining evidence.
50
Scenario: The suspected area of origin was heavily damaged during suppression, leaving insufficient evidence to identify an ignition source. What classification may be appropriate?
Undetermined, if the available evidence does not reliably support a specific cause.
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