From a targeted attack at sunrise to the high-tech forensic labs, this episode pulls back the yellow tape to reveal the chemistry of crime-solving. We explore the critical toolkit of forensic scientists, starting with the high-stakes difference between quick presumptive tests—like the pink-turning Kastle-Meyer test—and the definitive confirmatory tests that hold up in a court of law.
We dive into the investigation of firearms, explaining how the Modified Griess Test uncovers invisible gunpowder residue and how GC-MS technology creates a \"molecular fingerprint\" to identify unknown substances. Finally, we demystify the world of DNA analysis, from the \"copy machine\" power of PCR to the specialised Y-STR testing used to isolate genetic profiles. Whether it’s analysing a stained kitchen knife or searching the CODIS database for a match, discover how hard evidence ensures justice is served.
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