FDC Evidence Collection & Preservation 2

Question 1

Which packaging material is MOST appropriate for storing wet biological evidence such as bloodstained clothing?

Accepted Answer

Paper bag to allow moisture to escape and prevent mold

Answer

Wet biological evidence must be packaged in paper (not plastic) to allow airflow that prevents mold and bacterial overgrowth that would degrade DNA.

Question 2

A chain of custody document for DNA evidence MUST record which of the following each time the evidence changes hands?

Accepted Answer

The identity of each person handling it, date, time, and reason for transfer

Answer

Chain of custody requires documenting who handled the evidence, when, and why at every transfer to demonstrate unbroken accountability.

Question 3

When collecting a buccal swab reference sample, the collector should ensure the donor has NOT eaten, drunk, or smoked for at least how long prior to collection?

Accepted Answer

30 minutes

Answer

A 30-minute abstention period before buccal swabbing reduces the risk of food particles and foreign DNA contaminating the reference sample.

Question 4

Which of the following is the correct sequence for collecting multiple swabs from the same stain on a surface?

Accepted Answer

Wet swab first to rehydrate cells, then dry swab to absorb the released material

Answer

The wet-dry (or double-swab) technique uses a wet swab to rehydrate the stain and a dry swab to absorb the lifted cellular material, maximizing DNA yield.

Question 5

Luminol testing at a crime scene can affect subsequent DNA analysis primarily because it:

Accepted Answer

May inhibit PCR amplification when luminol residue is present in extracts

Answer

Luminol contains hydrogen peroxide and sodium hydroxide that can carry over into extracts and inhibit PCR, reducing or eliminating DNA typing success.

(FDC) Forensic DNA Certification Practice Test

(FDC) Forensic DNA Certification Practice Test

FDC Evidence Collection & Preservation 2