DRE DRE Toxicology & Drug Testing 1 — Questions and Answers
Question 1: Which biological specimen is most commonly requested in a DRE investigation to confirm drug presence?
- Urine
- Blood (Correct answer)
- Saliva
- Hair
Correct answer: Blood
Blood is the preferred specimen in DRE cases because it most accurately reflects the drug concentration present at the time of impairment.
Question 2: What is the term for the process by which the body breaks down a drug into metabolites?
- Absorption
- Distribution
- Metabolism (Correct answer)
- Excretion
Correct answer: Metabolism
Metabolism refers to the biochemical transformation of a drug into metabolites, primarily occurring in the liver.
Question 3: A DRE suspect's blood draw should ideally be collected within how many hours of driving to capture peak drug levels?
- 1 hour
- 2 hours
- 4 hours (Correct answer)
- 8 hours
Correct answer: 4 hours
Blood should be collected within approximately 4 hours of driving to best capture relevant drug concentrations for most substances.
Question 4: Which drug category is most likely to produce a mydriasis (pupil dilation) finding on a toxicology-correlated DRE exam?
- Narcotic analgesics
- Cannabis
- CNS stimulants (Correct answer)
- Depressants
Correct answer: CNS stimulants
CNS stimulants such as cocaine and methamphetamine cause sympathetic activation, resulting in dilated (mydriatic) pupils.
Question 5: In DRE toxicology, what does a 'confirmatory test' such as GC-MS verify?
- The identity and quantity of a specific drug (Correct answer)
- The suspect's sobriety status
- The officer's chain of custody
- The time of last dose
Correct answer: The identity and quantity of a specific drug
GC-MS (gas chromatography–mass spectrometry) is used to confirm the specific identity and concentration of a drug detected in a specimen.
Question 6: Which phenomenon describes a drug requiring increasingly higher doses to achieve the same effect over time?
- Sensitization
- Tolerance (Correct answer)
- Synergism
- Antagonism
Correct answer: Tolerance
Tolerance occurs when the body adapts to a drug so that higher doses are needed to produce the original effect, which can complicate impairment assessment.
DRE DRE Toxicology & Drug Testing 1
Which biological specimen is most commonly requested in a DRE investigation to confirm drug presence?