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Drug-testing methods and clinical interpretations of test results
1Addiction Research Foundation, Toronto, Ontario, Canada.
Bulletin on Narcotics
|January 1, 1993
Summary
Drug testing accurately identifies substances but not impairment. Strict laboratory standards and quality control are crucial to prevent errors and protect individuals from false positives in drug detection.
Area of Science:
- Forensic Toxicology
- Analytical Chemistry
Background:
- Current drug testing methods detect substance presence but not impairment.
- Challenges exist in determining drug administration details from lab results.
- Drug selection for testing depends on availability, abuse potential, and analytical feasibility.
Purpose of the Study:
- To discuss critical issues in drug testing.
- To highlight limitations and potential errors in drug detection.
- To emphasize the importance of stringent laboratory standards.
Main Methods:
- Gas chromatography coupled with mass spectrometry (GC/MS) as a confirmatory method.
- Immunoassay screening as a preliminary step.
- Techniques to detect sample adulteration and minimize errors.
Main Results:
- Drug tests can yield incorrect results due to interference or adulteration.
- GC/MS is the gold standard for confirmatory drug testing.
- Proper laboratory practices are essential for accurate drug detection.
Conclusions:
- Accurate drug testing requires adherence to strict laboratory performance standards.
- Qualified personnel, proper equipment, and quality control are vital.
- Confidentiality and chain-of-custody are paramount in forensic drug testing.