American Board Of Criminalistics Drug
Analysis Certification Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which technique is most commonly used for confirmatory identification of
controlled substances in forensic drug analysis?
A. Thin Layer Chromatography
B. Gas Chromatography-Mass Spectrometry
C. Ultraviolet Spectroscopy
D. Color Spot Test
Answer: B
Rationale: Gas Chromatography-Mass Spectrometry (GC-MS) is considered
the gold standard for confirmatory drug identification because it combines
separation and structural identification. The mass spectrum provides a
unique chemical fingerprint that allows forensic scientists to distinguish
compounds with high specificity and reliability, unlike presumptive tests
which only indicate possible presence.
2. Which of the following is a presumptive test for cocaine?
A. Scott Test
B. Marquis Test
C. Duquenois-Levine Test
D. Kastle-Meyer Test
Answer: A
Rationale: The Scott Test is a colorimetric presumptive test specifically used
, for cocaine identification. It produces a characteristic blue color reaction,
but it is not confirmatory and must be followed by instrumental analysis
such as GC-MS for legal reliability.
3. The primary purpose of derivatization in GC analysis is to:
A. Increase sample volume
B. Improve volatility and stability of compounds
C. Destroy interfering compounds
D. Reduce instrument calibration
Answer: B
Rationale: Derivatization chemically modifies compounds to increase
volatility, thermal stability, and detectability in gas chromatography.
Many drug compounds are not naturally volatile, so derivatization
enables accurate separation and detection without decomposition.
4. Which drug class is typically detected using the Marquis reagent?
A. Barbiturates and benzodiazepines
B. Opiates and amphetamines
C. Cannabis only
D. Cocaine only
Answer: B
Rationale: The Marquis reagent produces color changes with opiates and
amphetamines, making it a widely used presumptive test in forensic drug
screening. However, interpretation can vary, so confirmatory testing is
always required.
5. A chromatogram peak represents:
A. Chemical weight
B. Detector response over time
C. Solvent polarity
D. Sample color intensity
Answer: B
Rationale: In chromatography, a peak represents the detector’s response
, as a compound elutes from the column over time. The position and area of
the peak help identify and quantify substances.
6. Which of the following is a common cutting agent in illicit cocaine samples?
A. Lactose
B. Acetaminophen
C. Boric acid
D. All of the above
Answer: D
Rationale: Illicit drugs are often diluted with various adulterants or cutting
agents such as lactose, acetaminophen, and boric acid to increase volume
and profit. These substances can complicate analytical detection and
interpretation.
7. The Duquenois-Levine test is primarily used for:
A. Heroin
B. Cannabis
C. Methamphetamine
D. LSD
Answer: B
Rationale: The Duquenois-Levine test is a presumptive color test used for
cannabis identification. A positive reaction produces a purple color when
chloroform is added after initial reagent reaction.
8. Which instrument separates compounds based on boiling point and
polarity?
A. FTIR
B. Gas Chromatography
C. Mass Spectrometry
D. UV Spectrophotometer
Answer: B
Rationale: Gas Chromatography separates compounds based on volatility
(boiling point) and interaction with the stationary phase, allowing
individual components of a mixture to be analyzed separately.
Analysis Certification Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which technique is most commonly used for confirmatory identification of
controlled substances in forensic drug analysis?
A. Thin Layer Chromatography
B. Gas Chromatography-Mass Spectrometry
C. Ultraviolet Spectroscopy
D. Color Spot Test
Answer: B
Rationale: Gas Chromatography-Mass Spectrometry (GC-MS) is considered
the gold standard for confirmatory drug identification because it combines
separation and structural identification. The mass spectrum provides a
unique chemical fingerprint that allows forensic scientists to distinguish
compounds with high specificity and reliability, unlike presumptive tests
which only indicate possible presence.
2. Which of the following is a presumptive test for cocaine?
A. Scott Test
B. Marquis Test
C. Duquenois-Levine Test
D. Kastle-Meyer Test
Answer: A
Rationale: The Scott Test is a colorimetric presumptive test specifically used
, for cocaine identification. It produces a characteristic blue color reaction,
but it is not confirmatory and must be followed by instrumental analysis
such as GC-MS for legal reliability.
3. The primary purpose of derivatization in GC analysis is to:
A. Increase sample volume
B. Improve volatility and stability of compounds
C. Destroy interfering compounds
D. Reduce instrument calibration
Answer: B
Rationale: Derivatization chemically modifies compounds to increase
volatility, thermal stability, and detectability in gas chromatography.
Many drug compounds are not naturally volatile, so derivatization
enables accurate separation and detection without decomposition.
4. Which drug class is typically detected using the Marquis reagent?
A. Barbiturates and benzodiazepines
B. Opiates and amphetamines
C. Cannabis only
D. Cocaine only
Answer: B
Rationale: The Marquis reagent produces color changes with opiates and
amphetamines, making it a widely used presumptive test in forensic drug
screening. However, interpretation can vary, so confirmatory testing is
always required.
5. A chromatogram peak represents:
A. Chemical weight
B. Detector response over time
C. Solvent polarity
D. Sample color intensity
Answer: B
Rationale: In chromatography, a peak represents the detector’s response
, as a compound elutes from the column over time. The position and area of
the peak help identify and quantify substances.
6. Which of the following is a common cutting agent in illicit cocaine samples?
A. Lactose
B. Acetaminophen
C. Boric acid
D. All of the above
Answer: D
Rationale: Illicit drugs are often diluted with various adulterants or cutting
agents such as lactose, acetaminophen, and boric acid to increase volume
and profit. These substances can complicate analytical detection and
interpretation.
7. The Duquenois-Levine test is primarily used for:
A. Heroin
B. Cannabis
C. Methamphetamine
D. LSD
Answer: B
Rationale: The Duquenois-Levine test is a presumptive color test used for
cannabis identification. A positive reaction produces a purple color when
chloroform is added after initial reagent reaction.
8. Which instrument separates compounds based on boiling point and
polarity?
A. FTIR
B. Gas Chromatography
C. Mass Spectrometry
D. UV Spectrophotometer
Answer: B
Rationale: Gas Chromatography separates compounds based on volatility
(boiling point) and interaction with the stationary phase, allowing
individual components of a mixture to be analyzed separately.
