ETC ETC Laboratory Analysis & Forensic Science 1

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

Ninhydrin reacts with amino acids left by skin oils to develop purple-colored latent prints on porous surfaces like paper.

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

A control sample provides a known baseline so analysts can confirm the test is performing correctly and results are valid.

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

GC-MS separates compounds by gas chromatography then identifies them by mass spectrometry, providing highly accurate drug identification.

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

The Scott test produces a blue color in the presence of cocaine, serving as a presumptive indicator before confirmatory analysis.

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

Forensic toxicology analyzes biological specimens such as blood and urine to detect, identify, and quantify drugs, alcohol, and poisons.

(ETC) Evidence Technician Certification Practice Test