DRE DRE Toxicology & Drug Testing 2

Question 1

Which type of drug interaction occurs when two substances together produce a greater-than-additive effect?

Accepted Answer

Synergism

Answer

Synergism (or potentiation) occurs when two drugs combine to produce an effect greater than the sum of their individual effects, increasing impairment risk.

Question 2

A urine immunoassay screening test that returns a positive result must then undergo which step before being admissible in court?

Accepted Answer

GC-MS confirmatory testing

Answer

Positive immunoassay screens must be confirmed with GC-MS to provide the specificity and precision required for court proceedings.

Question 3

Hallucinogens such as LSD primarily affect which neurotransmitter system, which DREs should understand when correlating findings?

Accepted Answer

Serotonin

Answer

LSD and other classic hallucinogens exert their effects primarily through agonism at serotonin (5-HT2A) receptors, producing perceptual distortions.

Question 4

What is the half-life concept important for in a DRE toxicology context?

Accepted Answer

Estimating when a drug's concentration decreases by 50%

Answer

Half-life describes the time required for the plasma concentration of a drug to decrease by half, helping DREs understand the duration of likely impairment.

Question 5

Dissociative anesthetics like PCP can produce which unique toxicological finding relevant to a DRE evaluation?

Accepted Answer

Horizontal gaze nystagmus without alcohol

Answer

PCP and other dissociative drugs can produce horizontal gaze nystagmus (HGN) independent of alcohol ingestion, which must be distinguished during evaluation.

(DRE) Drug Recognition Expert Certification Practice Test

(DRE) Drug Recognition Expert Certification Practice Test

DRE DRE Toxicology & Drug Testing 2