CFI Evidence Collection & Chain of Custody 2

Question 1

When packaging liquid accelerant samples for laboratory analysis, which container type is most appropriate?

Accepted Answer

Unlined paint cans or glass jars with airtight lids

Answer

Unlined metal paint cans or glass jars with airtight lids prevent evaporation and chemical contamination of liquid accelerant samples.

Question 2

A fire investigator discovers a suspicious device at the origin. Who should be contacted FIRST before the device is moved or collected?

Accepted Answer

A bomb disposal/EOD unit

Answer

Any suspected incendiary device must be evaluated by a bomb disposal/EOD unit before an investigator attempts to collect or move it.

Question 3

Which action is required when transferring physical fire evidence between investigators?

Accepted Answer

Both parties must sign and date the chain of custody form

Answer

Both the releasing and receiving parties must sign and date the chain of custody form to document every transfer of physical evidence.

Question 4

What is the primary purpose of collecting a control (blank) sample at a fire scene?

Accepted Answer

To compare against debris samples and isolate introduced accelerants from background hydrocarbons

Answer

Control samples capture the pre-existing hydrocarbon background of unburned materials so lab analysts can distinguish accelerants from naturally occurring compounds.

Question 5

Under NFPA 921, what minimum amount of fire debris is recommended when collecting samples for accelerant analysis?

Accepted Answer

Enough to fill at least one-third to one-half of the collection container

Answer

NFPA 921 recommends filling the sample container one-third to one-half to allow headspace for volatile vapors that the lab will sample.

(CFI) Certified Fire Investigator Practice Test

(CFI) Certified Fire Investigator Practice Test

CFI Evidence Collection & Chain of Custody 2