Courtroom Testimony and Expert Witness Skills
Q: What is the term for evidence that is created after the crime to illustrate or explain other evidence?
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True. **Gas Chromatography-Mass Spectrometry (GC-MS)** is a cornerstone analytical technique in forensic chemistry, especially for drug analysis and toxicology. The **gas chromatography (GC)** component separates the complex mixture of compounds in a sample (like blood, urine, or seized drug powder) based on their volatility and interaction with a column. As compounds exit the GC column, they enter the **mass spectrometer (MS)**, which bombards them with electrons, causing them to fragment. The MS produces a mass spectrum—a unique 'fingerprint' pattern of fragments for each compound. By comparing the sample's mass spectrum to reference libraries, forensic chemists can definitively identify specific drugs (e.g., cocaine, methamphetamine), their metabolites, poisons, or accelerants in arson cases. GC-MS is highly sensitive, specific, and is considered a 'gold standard' for confirming the presence of organic compounds in forensic samples.
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