ETC ETC Laboratory Analysis & Forensic Science

Question 1

Which type of analysis uses ninhydrin reagent to develop latent fingerprints on porous surfaces such as paper?

Accepted Answer

Amino acid-based chemical development

Answer

Cyanoacrylate fuming

Answer

Alternate light source illumination

Answer

Magnetic powder dusting

Question 2

What is the purpose of a control sample in forensic laboratory analysis?

Accepted Answer

To establish a baseline for comparison and validate test results

Answer

To replace the original evidence during testing

Answer

To document the chain of custody of the sample

Answer

To store evidence in a refrigerated environment

Question 3

Which analytical technique is considered the gold standard for identifying and quantifying drugs in seized samples?

Accepted Answer

Gas chromatography-mass spectrometry (GC-MS)

Answer

Thin-layer chromatography (TLC)

Answer

Colorimetric field testing

Answer

Infrared spectroscopy only

Question 4

An evidence technician submits a white powder to the lab. Which presumptive test would indicate the possible presence of cocaine?

Accepted Answer

Scott test (cobalt thiocyanate)

Answer

Marquis reagent test

Answer

Duquenois-Levine test

Answer

Mecke reagent test

Question 5

What does a forensic toxicology report primarily establish in a criminal investigation?

Accepted Answer

The presence, identity, and concentration of substances in biological specimens

Answer

The manner of death as determined by a coroner

Answer

The timeline of events at the crime scene

Answer

The psychological profile of the suspect

Question 6

When submitting biological evidence to a forensic lab, which packaging material is preferred over plastic bags?

Accepted Answer

Paper bags or paper envelopes

Answer

Sealed plastic zip-lock bags

Answer

Aluminum foil wrapping

Answer

Vacuum-sealed plastic pouches