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Evidence, chain of custody and bias

Adult · 35 minutes · Explain how forensic evidence stands or falls.

Visual learning map for Evidence, chain of custody and bias: observe, try, then explain. Explain how forensic evidence stands or falls.
Visual learning map for Evidence, chain of custody and bias: observe, try, then explain. Explain how forensic evidence stands or falls.

Answer by: Type. You can change method or take a break at any time.

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Our learning goal

Explain how forensic evidence stands or falls.

Your turn: Choose one thing you would like to understand by the end.

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Full teaching script
  1. Today: Evidence, chain of custody and bias. Our goal: Explain how forensic evidence stands or falls.
  2. Take one idea at a time. Pause after each sentence; ask for repetition whenever you need it.
  3. Locard's principle says every contact leaves a trace — but a trace only becomes evidence if its journey is unbroken. Chain of custody records who held the item, when, and in what sealed state; one gap and a court may exclude it. Interpretation carries risk too: contextual bias, where an examiner knows the suspect's identity, measurably shifts conclusions, so blind verification matters. Match probabilities are statements about coincidence, never about guilt — the prosecutor's fallacy inverts them and has convicted innocent people.
  4. Together: choose one example from the explanation and show how it works. What do you notice?
  5. Your turn: Write a chain-of-custody log for a single item from scene to court.
  6. Reflect: what made sense, and what would you like explained differently?
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