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Techniques in Evidence Collection

This guide outlines essential techniques for collecting evidence at crime scenes, emphasizing the importance of contamination prevention and maintaining the integrity of collected items. It highlights the necessity of using clean collection methods, including changing gloves frequently and using bleach on equipment. Proper labeling of evidence and maintaining a chain of custody are crucial for ensuring legal admissibility. Each item must be individually packaged and labeled with relevant details, including the collector’s initials. These procedures help ensure thorough and reliable forensic investigations.

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Techniques in Evidence Collection

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  1. Techniques in Evidence Collection Forensic Crime Scene Unit

  2. Procedures for Collecting • Must prevent any change from taking place • Contamination, breakage, evaporation, accidental scratching, bending, loss • Pack all evidence separately

  3. Clean Techniques • Change gloves frequently • Use a new pair of gloves for each item • Bleach equipment after each use • Avoid coughing, sneezing, talking over evidence • Package in clean unused products

  4. Proper Labeling • Your name • Case number • Case name • Date Recovered • Item description • Location recovered • Items suspected of biological material must be labeled with a biohazard sticker

  5. CHAIN OF CUSTODY There must be a written record of all people who have had possession of an item of evidence. • The evidence container must be marked for identification • The collector’s initials should be placed on the seal • If evidence is turned over to another person, the transfer must be recorded.

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