What is the gold standard for drug testing?

• A. Mass Spectrometry
• B. Capillary Electrophoresis
• C. Gas Chromatography/Mass Spectrometry
• D. Thin Layer Chromatography (TLC)

Answer: (C)

In drug testing, decisive identification requires both separating the components and confirming their identity. Gas chromatography paired with mass spectrometry does exactly that: the gas chromatography step separates the sample's constituents, and the mass spectrometry step analyzes each separated compound to produce a unique fingerprint that can be matched to known standards. This combination provides highly specific and quantitative results, reducing false positives and giving robust confirmation. That is why GC/MS is regarded as the gold standard for confirming drugs. Other methods may be useful for screening or rapid checks, but they don’t offer the same level of definitive identification and quantification in complex samples.