Principles of Biomedical Technology (Principles of Biomedical Science)Chain-of-custody flow from collection to receiver signature Chain-of-custody flow from collection to receiver signature
Unit 1: Unit 1.1 Investigating the ScenePBS 1.1Handling, Preparation, Storage and Disposal
Maintain Chain Of Custody
Keep evidence trustworthy by recording every label, seal, handoff, time, and receiver.
Builds on (2 levels back)inferred · high confidence
- Observation vs. inference: Forensic work starts by separating what was seen from what is concluded.
- Evidence identity: Labels, photos, and logs keep evidence tied to the right source.
Prerequisites are inferred: pending teacher review.
Re-learn the skill with worked practice and clear examples.
Keep evidence trustworthy by recording every label, seal, handoff, time, and receiver.
Step 1: Learn the key
A custody record must show the evidence , collector, seal status, handoff , and receiver signature.
Step 2: Use the model
Read the figure, table, control, range, or protocol before choosing an answer.
Step 3: Name the limit
Say what the evidence can support and what it cannot prove yet.
Practice
Use the custody flow. Which step comes right after collection?
Reviewed- A.Open the bag to photograph the item inside
- B.Send the bag to the lab before labeling it
- C.Write the final report before sealing the bag
- D.Label and seal the evidence
Show the worked solution ▾
Answer: D. Label and seal the evidence
- Step 1: Follow the flow: The diagram shows collect then label + seal.
- Step 2: Protect evidence: Labeling and sealing preserve identity and integrity.
Why it's right: Label and seal comes after collection.
Why the others miss:
- A: Photos are taken at the scene; opening a sealed bag breaks custody.
- B: Transport comes later; an unlabeled bag breaks the custody record.
- C: The report comes after handling; sealing happens right at collection.
Aligned to Handling, Preparation, Storage and Disposal · reading level ~grade 9
Where you'd see this
- In Unit 1.1 Investigating the Scene, this skill turns class evidence into a result another person can check.
Video library
Watch: Maintain Chain Of Custody
Forensics Lesson: Evidence Collection & Chain of Custody (updated)
The Trendy Science Teacher
Guided notes
Fill these in as you work through the lesson.
Big idea: Keep evidence trustworthy by recording every label, seal, handoff, time, and receiver.
Key terms: write the meaning
- Chain of custody (record of who handled evidence):
- Seal (tamper-evident closure):
- Handoff (transfer from one person to another):
- Evidence ID (unique sample label):
The rule
A custody record must show the evidence , collector, seal status, handoff , and receiver signature.
Check yourself
- Who collected the sample?
- Is the seal intact?
- Who received it and when?
Work one example
Write a custody entry for Item A12 transferred from Rivera to Chen at 10:42 AM.