John Hay
John Hay Biomedical
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Principles of Biomedical Technology (Principles of Biomedical Science)
Unit 1: Unit 1.1 Investigating the ScenePBS 1.1Biotechnology Research and Experiments

Collect Trace Biometric Evidence

Collect small trace evidence and body-based biometric evidence without contaminating it.

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.

Collect small trace evidence and body-based biometric evidence without contaminating it.

Step 1: Learn the key
Use clean tools, collect the [blank] evidence, and package it separately with a [blank] sample when possible.
EvidenceTypeCollection note
Hair fiberTraceuse forceps, paper bindle
FingerprintBiometriclift or photograph
ShoeprintImpressionphotograph with scale
Control fiberControl sampleknown comparison
Trace and biometric evidence table
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 trace evidence table. Which collection note fits a fingerprint?

Reviewed
EvidenceTypeCollection note
Hair fiberTraceuse forceps, paper bindle
FingerprintBiometriclift or photograph
ShoeprintImpressionphotograph with scale
Control fiberControl sampleknown comparison
Trace and biometric evidence table
  1. A.Lift or photograph it
  2. B.Place in liquid media
  3. C.Ask patient pain level
  4. D.Calculate mean
Show the worked solution ▾

Answer: A. Lift or photograph it

  1. Step 1: Find fingerprint row: The table lists fingerprint as biometric evidence.
  2. Step 2: Read note: The note says lift or photograph.

Why it's right: Fingerprints should be lifted or photographed.

Why the others miss:
  • B: Liquid media is for cultures, not prints.
  • C: Pain level is clinical history.
  • D: Mean is a statistic.

Aligned to Biotechnology Research and Experiments · 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.
Careers that use this
Forensic Science Technician: Uses collect trace/biometric evidence to make a decision from evidence without overclaiming.
Video library
Watch: Collect Trace Biometric Evidence
How to Collect Hair & Fiber Evidence at a Crime Scene
National Forensic Academy
Guided notes

Fill these in as you work through the lesson.

Big idea: Collect small trace evidence and body-based biometric evidence without contaminating it.
Key terms: write the meaning
  • Trace evidence (small transferred material):  
  • Biometric evidence (body-based identifier):  
  • Control sample (known comparison sample):  
  • Contamination (unwanted material added):  
The rule

Use clean tools, collect the   evidence, and package it separately with a   sample when possible.

Check yourself
  1. Is the clue trace or biometric? 
  2. What tool prevents contamination? 
  3. What known sample would help comparison? 
Work one example

A fiber is found on a jacket. Choose a collection tool, package, and control sample.