DRE Toxicology & Drug Testing Flashcards

Which drug testing matrix provides the longest detection window for most substances, useful for historical drug use context?

Answer: Hair

Hair testing can detect drug use going back 90 days or more, offering a long-term history that blood, urine, and saliva cannot provide.

The concept of 'zero-order kinetics' in drug metabolism means that the body eliminates a drug at what rate?

Answer: A constant amount per unit time regardless of concentration

Zero-order kinetics means the body removes a fixed amount of the drug per unit of time regardless of how much is present — alcohol follows this pattern.

A DRE who observes both depressant indicators and stimulant indicators simultaneously should consider which drug category?

Answer: Combined drug intoxication (polydrug use)

Conflicting or mixed signs across drug categories strongly suggest polydrug use, which is a common and important consideration in DRE evaluations.

Why is oral fluid (saliva) testing increasingly used at roadside DRE checkpoints?

Answer: It is non-invasive and reflects recent drug use

Oral fluid is favored at roadside because it is non-invasive, easy to collect, and reflects relatively recent drug exposure correlating with impairment.

Which pharmacokinetic phase involves a drug moving from the bloodstream into body tissues and organs?

Answer: Distribution

Distribution is the process by which a drug travels from the bloodstream into tissues, organs, and the central nervous system where it exerts its effects.

In DRE toxicology, 'cross-reactivity' is a concern with immunoassay screening because it can cause what?

Answer: A substance not being the target drug to trigger a positive screen

Cross-reactivity occurs when a structurally similar compound (e.g., a cold medication) triggers the immunoassay for a different target drug, leading to a false positive.