Documentation and custody
Thu, Sep 10, 2026 · Week 3 · Principles of Biomedical Technology (Principles of Biomedical Science)
Today's goal: Explain forensic documentation steps and chain of custody, then complete the PLTW scene task online.
This is a model of the work you should turn in today. Use it to check your own: match the structure and the level of detail, do not copy it. Your data and wording should be your own.
Four documentation steps in order:
1. Photograph the scene
2. Sketch the scene with measurements
3. Log each item
4. Collect each item
Three required chain-of-custody fields:
- Who collected the item
- Date and time of collection
- A signature at every transfer
Why the order matters: photographing and sketching first captures the scene before anything is disturbed, so collection never destroys the record of how the scene looked.
| Order | Documentation step |
|---|---|
| 1 | Photograph |
| 2 | Sketch with measurements |
| 3 | Log each item |
| 4 | Collect |
This model shows the level of evidence and organization needed to complete: An exit ticket that has the student sequence the scene-documentation steps and list required chain-of-custody record fields, checking recall of the scene task.
- Name the prompt or task.
- Answer it directly with the key evidence.
- Check that the response matches the requested format.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Hand in your exit ticket before leaving class. Also complete the online investigating-the-scene task.
Claim ceiling: Today's evidence supports a classroom claim about today's lesson. It cannot prove causation, diagnose a real patient, or justify action outside this room.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Sequencing scene documentation and identifying valid custody-record fields.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.