Lesson 6: Unraveling the Evidence: A Forensic Science Investigation

What is the role of evidence in solving crime?

What is the difference between evidence and trace evidence?

Can evidence become contaminated?

Trace evidence
Evidence
Fingerprints
DNA
Hair and Fiber

HS-LS3-1: Apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population.
HS-LS3-2: Make and defend a claim based on evidence that inheritable genetic variations may result from: (1) new genetic combinations through meiosis, (2) viable errors occurring during replication (mutations), and/or (3) changes to gene expression.  
HS-ETS1-2: Design a solution to a complex real-world problem by breaking it down into smaller, more manageable problems that can be solved through engineering.
HS-ETS1-3: Evaluate a solution to a complex real-world problem based on prioritized criteria and trade-offs that account for a range of limitations, including cost, safety, reliability, and aesthetics, as well as possible social, cultural, and environmental impacts.  
Science and Engineering Practices: Analyzing and Interpreting Data, Constructing Explanations, Designing Solutions, Engaging in Argument from Evidence.  
Crosscutting Concepts:

Patterns, Cause and Effect, Scale, Proportion, and Quantity, Systems and System Models.  

NA

DOK 1 (Recall): Define key forensic terms, list types of evidence.
DOK 2 (Skill/Concept): Analyze fingerprints, compare hair samples, interpret blood spatter patterns.
DOK 3 (Strategic Thinking): Design an investigation, construct an argument from evidence, explain the limitations of a technique.
DOK 4 (Extended Thinking): Evaluate the impact of forensic science on society, conduct an independent research project.

Discuss the history of forensics in different cultures (e.g., ancient Chinese fingerprinting).

Discussion of the history of fingerprinting within the colonial era and how it was used to identify people.

Discuss the ethical implications of DNA databases and their potential impact on different communities.

Discuss the impact of environmental toxins on specific communities.

DNA always provides a definitive answer.

"CSI effect" - real forensics vs. TV shows.

Provide varying levels of complexity in evidence analysis.
Offer alternative assessment formats (e.g., presentations, written reports, visual displays).
Provide additional support for students who need it.
By incorporating hands-on activities, real-world scenarios, and addressing common misconceptions, this unit will engage students and provide a comprehensive understanding of forensic science.

• Laboratory reports
• Case study analysis and presentations
• Quizzes and tests
• Class participation
• Crime scene documentation

Book

J. Benet video clips

Evidence collection bags/containers

Mock crime scene