Toxicology: sampling in drug-facilitated assault: practice question

A Forensic Medicine question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Forensic Medicine · Toxicology: sampling in drug-facilitated assault

Sample item

A woman reports amnesia and suspected sexual assault after an evening at a party, and a drug-facilitated assault is suspected. Why should a urine sample be collected as early as possible?

AUrine concentrates the drug more after a day and causes false positivesBA late sample is inadmissible whatever the resultCThe preservative works only in the first few hoursDMany such agents are cleared quickly and soon become undetectable

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

D. Many such agents are cleared quickly and soon become undetectable

Agents used in drug-facilitated assault, such as gamma-hydroxybutyrate and short-acting benzodiazepines, are eliminated quickly. They may be undetectable within hours to a day or two, so urine and blood should be collected at the first contact, with consent and a proper chain of custody. Delay cannot be avoided in some cases, but the sample should still be taken.

Option by option

A. Urine concentrates the drug more after a day and causes false positives
Concentration over time does not produce false positives, and levels fall.
B. A late sample is inadmissible whatever the result
A late sample can still be admissible, but a negative result is less informative.
C. The preservative works only in the first few hours
Preservatives act over a long period and do not have a short window.
D. Many such agents are cleared quickly and soon become undetectable (correct)
Correct. Rapid elimination narrows the window in which the drug can be found.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

Questions about this Forensic Medicine question

What is the answer to this Forensic Medicine question?

The best answer is D, Many such agents are cleared quickly and soon become undetectable. Agents used in drug-facilitated assault, such as gamma-hydroxybutyrate and short-acting benzodiazepines, are eliminated quickly.

Why is "Urine concentrates the drug more after a day and causes false positiv…" not the answer?

Concentration over time does not produce false positives, and levels fall.

Why is "A late sample is inadmissible whatever the result" not the answer?

A late sample can still be admissible, but a negative result is less informative.

Why is "The preservative works only in the first few hours" not the answer?

Preservatives act over a long period and do not have a short window.

What concept does this question test?

It tests Toxicology: sampling in drug-facilitated assault in Forensic Medicine. They may be undetectable within hours to a day or two, so urine and blood should be collected at the first contact, with consent and a proper chain of custody. Delay cannot be avoided in some cases, but the sample should still be taken.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Toxicology: sampling in drug-facilitated assault?

Learn postmortem changes with their timelines, and toxicology as poison, sign, test and antidote. Then use the flashcards and the other Forensic Medicine questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.