BSFS Forensic Chemistry and Toxicology 3

Question 1

Which schedule under the U.S. Controlled Substances Act includes drugs with the highest potential for abuse and no accepted medical use?

Accepted Answer

Schedule I

Answer

Schedule I substances, such as heroin and LSD, are classified as having the highest abuse potential and no currently accepted medical use in the United States.

Question 2

The Widmark formula is used in forensic toxicology to:

Accepted Answer

Estimate blood alcohol concentration based on amount consumed, body weight, and time

Answer

The Widmark formula allows forensic scientists and investigators to retrospectively estimate a person's BAC at a specific time based on consumption, body weight, and distribution factor.

Question 3

Which class of compounds does the Duquenois-Levine test presumptively identify?

Accepted Answer

Cannabinoids (marijuana)

Answer

The Duquenois-Levine test produces a purple color in the presence of THC and other cannabinoids and is the standard presumptive test for marijuana.

Question 4

In toxicology, 'LD50' refers to:

Accepted Answer

The dose lethal to 50% of a test population

Answer

LD50 (lethal dose 50) is the standard measure of acute toxicity representing the dose that kills half of the tested animal population under defined conditions.

Question 5

Solid-phase extraction (SPE) is used in forensic toxicology labs primarily for:

Accepted Answer

Isolating and purifying drug compounds from biological matrices before analysis

Answer

SPE separates target analytes from complex biological matrices such as blood or urine to improve analytical sensitivity and specificity before GC-MS or LC-MS analysis.

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS - Bachelor of Science in Forensic Science Practice Test

BSFS Forensic Chemistry and Toxicology 3