Forensic Science: Crime Scene Investigation
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Forensic Science: Crime Scene Investigation

Grade 9Science10 days
In this Forensic Science: Crime Scene Investigation project, 9th-grade students take on the role of forensic scientists to reconstruct a crime scene using the scientific method and evidence analysis. Students develop observation skills, formulate testable hypotheses, design controlled experiments, and analyze data to communicate their findings effectively. The project emphasizes lab safety and responsible conduct, culminating in a comprehensive understanding of forensic science principles and their application in the justice system.
Forensic ScienceCrime Scene InvestigationScientific MethodEvidence AnalysisLab SafetyData Analysis
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Inquiry Framework

Question Framework

Driving Question

The overarching question that guides the entire project.How can we, as forensic scientists, use the scientific method and evidence analysis to reconstruct the events of a crime scene and determine what happened?

Essential Questions

Supporting questions that break down major concepts.
  • How do forensic scientists use the scientific method to solve crimes?
  • What types of evidence are collected and analyzed during a crime scene investigation?
  • How can observation skills improve forensic investigations?
  • How do you develop a testable hypothesis in forensic science?
  • How do you design a controlled experiment to test forensic evidence?
  • What are the different types of charts and graphs to represent forensic data?
  • How do you write a conclusion based on evidence collected during a crime scene investigation?
  • What are the most important safety procedures to follow in a forensic lab?

Standards & Learning Goals

Learning Goals

By the end of this project, students will be able to:
  • Apply the scientific method to a simulated crime scene investigation.
  • Collect, analyze, and interpret forensic evidence.
  • Develop and test hypotheses related to the crime scene.
  • Communicate findings effectively using data and evidence.
  • Understand and adhere to lab safety procedures.

NGSS

SP1
Primary
Asking questions (for science) and defining problems (for engineering)Reason: Students will formulate questions about the crime scene and define the problem of determining what occurred.
SP2
Secondary
Developing and using modelsReason: Students could develop models of the crime scene or of particular pieces of evidence to aid in their analysis.
SP3
Primary
Planning and carrying out investigationsReason: A core element of the project involves planning and executing a simulated crime scene investigation.
SP4
Primary
Analyzing and interpreting dataReason: Students will analyze evidence and data collected from the crime scene to draw conclusions.
SP5
Secondary
Using mathematics and computational thinkingReason: Mathematics may be used to calculate trajectories, analyze blood spatter, or perform other quantitative analyses.
SP6
Primary
Constructing explanations (for science), and designing solutions (for engineering)Reason: Students will construct explanations of what happened at the crime scene based on the evidence.
SP7
Primary
Engaging in argument from evidenceReason: Students will need to present and defend their findings based on the evidence they collected and analyzed.
SP8
Primary
Obtaining, evaluating, and communicating informationReason: Throughout the project, students will gather information, assess its reliability, and communicate their findings.

Entry Events

Events that will be used to introduce the project to students

Crime Scene Escape Room Challenge

Transform the classroom into a crime scene and challenge students to 'escape' by correctly analyzing evidence, solving puzzles based on forensic principles, and identifying the perpetrator. This gamified approach instantly immerses students in the world of forensic science and encourages collaborative problem-solving.
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Portfolio Activities

Portfolio Activities

These activities progressively build towards your learning goals, with each submission contributing to the student's final portfolio.
Activity 1

Observation Expedition: Sharpening Senses

Students begin by honing their observation skills, essential for crime scene analysis. This activity trains them to notice minute details and record them systematically.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Set up a mock crime scene with various objects and clues.
2. Instruct students to observe the scene for 10 minutes without touching anything.
3. Students record their observations in a detailed observation log, noting colors, shapes, sizes, textures, and spatial relationships.
4. Discuss the importance of objective observation and minimizing bias in forensic investigations.

Final Product

What students will submit as the final product of the activityA comprehensive observation log detailing all observed elements of the mock crime scene.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Collect, analyze, and interpret forensic evidence. Aligns with standard SP8: Obtaining, evaluating, and communicating information by emphasizing detailed and objective recording of initial observations.
Activity 2

Question Quest: Formulating Forensic Inquiries

Building on observation skills, students will formulate scientific questions about the crime scene, developing hypotheses to guide their investigation.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Review the observation logs from the previous activity.
2. Students brainstorm potential questions about the crime scene based on their observations.
3. Guide students to refine their questions into testable hypotheses using "If...then...because" statements.
4. Students select their strongest hypothesis to investigate further, justifying their choice.

Final Product

What students will submit as the final product of the activityA list of formulated scientific questions and a refined, testable hypothesis with a clear justification.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Develop and test hypotheses related to the crime scene. Aligns with standard SP1: Asking questions (for science) by guiding students to formulate relevant and testable questions based on their initial observations. Also aligns with SP6: Constructing explanations (for science) as students begin to form potential explanations for the events at the crime scene.
Activity 3

Procedure Protocol: Designing the Investigation

Students design a controlled experiment to test their hypothesis, focusing on identifying independent variables, dependent variables, constants, and control groups.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Students define the independent variable (the factor they will manipulate) and the dependent variable (the factor they will measure).
2. Students identify constants (factors that must remain the same) to ensure a fair test.
3. Students determine the control group (the standard for comparison).
4. Students write a detailed procedure outlining the steps of their experiment, including materials and safety precautions.

Final Product

What students will submit as the final product of the activityA comprehensive experimental procedure with clearly defined variables, constants, and control group, ready for implementation.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Apply the scientific method to a simulated crime scene investigation. Aligns with standard SP3: Planning and carrying out investigations by requiring students to design a controlled experiment with attention to variables and controls.
Activity 4

Data Decoder: Charting the Crime Scene Story

Students conduct their experiment, collect data, and represent their findings using appropriate charts and graphs to identify patterns and trends.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Students follow their experimental procedure and collect data, recording measurements accurately.
2. Students choose the most appropriate type of chart or graph (e.g., bar graph, scatter plot) to represent their data.
3. Students create their chart/graph using software or by hand, labeling axes and including a clear title and key.
4. Students analyze their chart/graph, identifying any trends or patterns in the data.

Final Product

What students will submit as the final product of the activityA visually clear chart or graph representing the collected data, along with a written analysis of the trends and patterns observed.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Collect, analyze, and interpret forensic evidence. Aligns with standard SP4: Analyzing and interpreting data by requiring students to represent data visually and draw conclusions based on their analysis. Also aligns with SP5: Using mathematics and computational thinking.
Activity 5

Conclusion Chronicle: Unraveling the Truth

Students write a conclusion based on the evidence collected during their experiment, explaining whether their hypothesis was supported or refuted and discussing the implications of their findings.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Students review their hypothesis, experimental procedure, data, and chart/graph.
2. Students state whether their data supported or refuted their hypothesis, providing specific evidence from their chart/graph to support their claim.
3. Students discuss any limitations of their experiment and suggest improvements for future investigations.
4. Students explain the broader implications of their findings in the context of the crime scene investigation.

Final Product

What students will submit as the final product of the activityA well-written conclusion that clearly states whether the hypothesis was supported, provides evidence-based reasoning, and discusses the limitations and implications of the experiment.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Communicate findings effectively using data and evidence. Aligns with standard SP6: Constructing explanations (for science) by requiring students to formulate a conclusion based on evidence and reasoning. Also aligns with SP7: Engaging in argument from evidence, as students must defend their conclusion with data.
Activity 6

Safety Sentinel: Forensic Lab Guardian

Students research and present the most important safety procedures to follow in a forensic lab, ensuring a safe and responsible learning environment.

Steps

Here is some basic scaffolding to help students complete the activity.
1. Students research common safety hazards in a forensic lab setting.
2. Students identify the most important safety procedures to prevent accidents and injuries.
3. Students create a presentation (e.g., poster, slideshow) outlining these safety procedures, including visuals and clear explanations.
4. Students present their safety guidelines to the class, emphasizing the importance of following procedures.

Final Product

What students will submit as the final product of the activityA comprehensive presentation outlining essential forensic lab safety procedures, designed to educate and inform classmates.

Alignment

How this activity aligns with the learning objectives & standardsAddresses Learning Goal: Understand and adhere to lab safety procedures. Aligns with standard SP8: Obtaining, evaluating, and communicating information by requiring students to research, synthesize, and present safety information.
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Rubric & Reflection

Portfolio Rubric

Grading criteria for assessing the overall project portfolio

Forensic Science Investigation Portfolio Rubric

Category 1

Observation & Detail

Ability to observe, record, and interpret details from the crime scene. Emphasizes objective data collection and minimizing bias.
Criterion 1

Completeness of Observation Log

Extent and thoroughness of recorded observations.

Exemplary
4 Points

Comprehensive observation log with meticulous details of all relevant aspects of the crime scene. Demonstrates exceptional attention to detail and systematic recording.

Proficient
3 Points

Detailed observation log with clear descriptions of most relevant aspects of the crime scene. Demonstrates good attention to detail and systematic recording.

Developing
2 Points

Observation log includes some details, but may be missing key elements or lack sufficient clarity. Shows some effort in systematic recording.

Beginning
1 Points

Observation log is incomplete and lacks detail. Demonstrates minimal effort in systematic recording.

Criterion 2

Objectivity & Bias Mitigation

Demonstrates ability to record observations objectively, minimizing personal bias or assumptions.

Exemplary
4 Points

Demonstrates exceptional objectivity in observations, clearly distinguishing between facts and assumptions. Actively identifies and mitigates potential sources of bias.

Proficient
3 Points

Demonstrates good objectivity in observations, with minimal influence of personal bias. Acknowledges potential sources of bias.

Developing
2 Points

Observations are somewhat influenced by personal bias or assumptions. Shows limited awareness of potential biases.

Beginning
1 Points

Observations are significantly influenced by personal bias or assumptions. Demonstrates little to no awareness of potential biases.

Category 2

Hypothesis Formulation

Ability to formulate testable scientific questions and develop a clear, justifiable hypothesis based on initial observations.
Criterion 1

Clarity of Question

How well the question is defined and focused.

Exemplary
4 Points

Formulates a clear, focused, and insightful question that directly addresses a key aspect of the crime scene.

Proficient
3 Points

Formulates a clear and focused question about the crime scene.

Developing
2 Points

Formulates a question that is somewhat unclear or unfocused.

Beginning
1 Points

Formulates a vague or irrelevant question.

Criterion 2

Testability of Hypothesis

The degree to which the hypothesis can be tested through experimentation.

Exemplary
4 Points

Develops a highly testable hypothesis with a clear "If...then...because" statement, demonstrating a sophisticated understanding of cause-and-effect relationships.

Proficient
3 Points

Develops a testable hypothesis with a clear "If...then...because" statement.

Developing
2 Points

Develops a hypothesis that is partially testable or lacks a clear "If...then...because" statement.

Beginning
1 Points

Develops a hypothesis that is not testable or lacks a logical connection to the observations.

Criterion 3

Justification of Hypothesis

Provides a well-reasoned rationale for the selected hypothesis, based on observations from the crime scene.

Exemplary
4 Points

Provides a compelling and insightful justification for the selected hypothesis, drawing direct connections to multiple observations and demonstrating a deep understanding of the crime scene context.

Proficient
3 Points

Provides a clear and logical justification for the selected hypothesis, based on observations from the crime scene.

Developing
2 Points

Provides a weak or incomplete justification for the selected hypothesis, with limited connection to observations.

Beginning
1 Points

Provides no justification or an irrelevant justification for the selected hypothesis.

Category 3

Experimental Design

Ability to design a controlled experiment to test the hypothesis, including identifying variables, constants, and controls.
Criterion 1

Identification of Variables

Clarity and accuracy in defining independent and dependent variables.

Exemplary
4 Points

Clearly and accurately defines both independent and dependent variables, demonstrating a sophisticated understanding of their relationship.

Proficient
3 Points

Clearly defines both independent and dependent variables.

Developing
2 Points

Identifies independent and dependent variables, but definitions may be unclear or inaccurate.

Beginning
1 Points

Fails to identify independent and dependent variables or provides incorrect definitions.

Criterion 2

Control of Constants

Identifies and controls relevant factors to ensure a fair test.

Exemplary
4 Points

Identifies and meticulously controls all relevant constants, demonstrating a thorough understanding of experimental control.

Proficient
3 Points

Identifies and controls most relevant constants.

Developing
2 Points

Identifies some constants, but may overlook important factors.

Beginning
1 Points

Fails to identify or control relevant constants.

Criterion 3

Appropriateness of Control Group

Selection and justification of an appropriate control group for comparison.

Exemplary
4 Points

Selects and justifies an ideal control group that provides a robust basis for comparison, demonstrating a deep understanding of experimental design.

Proficient
3 Points

Selects an appropriate control group and provides a clear justification.

Developing
2 Points

Selects a control group, but the appropriateness or justification is questionable.

Beginning
1 Points

Fails to select an appropriate control group or provides no justification.

Criterion 4

Procedure Clarity & Safety

The procedure is easy to follow, detailed and includes safety precautions.

Exemplary
4 Points

Writes a detailed, clear and easy-to-follow procedure that includes all necessary materials and safety precautions.

Proficient
3 Points

Writes a clear and easy-to-follow procedure that includes materials and safety precautions.

Developing
2 Points

Writes a procedure that is somewhat unclear or missing some steps, materials or safety precautions.

Beginning
1 Points

Writes a vague procedure that is hard to follow, and missing most of the steps, materials and safety precautions.

Category 4

Data Analysis & Representation

Ability to collect, represent, and analyze data using appropriate charts and graphs.
Criterion 1

Accuracy of Data Collection

Precision and correctness in recording experimental data.

Exemplary
4 Points

Collects and records data with exceptional accuracy and precision, demonstrating meticulous attention to detail.

Proficient
3 Points

Collects and records data accurately.

Developing
2 Points

Collects and records data with some inaccuracies.

Beginning
1 Points

Collects and records data with significant inaccuracies.

Criterion 2

Appropriateness of Chart/Graph

Selection of the most suitable chart or graph type for the data.

Exemplary
4 Points

Selects the most appropriate chart or graph to effectively represent the data and highlight key trends, demonstrating a sophisticated understanding of data visualization.

Proficient
3 Points

Selects an appropriate chart or graph to represent the data.

Developing
2 Points

Selects a chart or graph that is partially appropriate for the data.

Beginning
1 Points

Selects an inappropriate chart or graph for the data.

Criterion 3

Clarity & Accuracy of Representation

The chart or graph is clearly labeled, with accurate data representation.

Exemplary
4 Points

Creates a visually clear and accurate chart or graph with precise labeling and scaling, enhancing the understanding of the data.

Proficient
3 Points

Creates a clear and accurate chart or graph with appropriate labeling.

Developing
2 Points

Creates a chart or graph with some inaccuracies or unclear labeling.

Beginning
1 Points

Creates a chart or graph that is inaccurate and poorly labeled.

Criterion 4

Data Analysis and Pattern Identification

Ability to identify trends and patterns using the data.

Exemplary
4 Points

Insightfully analyzes the data, identifying subtle trends and patterns and drawing meaningful conclusions.

Proficient
3 Points

Analyzes the data, identifying clear trends and patterns.

Developing
2 Points

Attempts to analyze the data, but struggles to identify trends and patterns.

Beginning
1 Points

Does not analyze the data or identify trends and patterns.

Category 5

Conclusion & Implications

Ability to draw evidence-based conclusions, discuss limitations, and explain the broader implications of the findings.
Criterion 1

Evidence-Based Reasoning

Conclusion is supported by specific evidence from the data.

Exemplary
4 Points

Draws a well-supported conclusion based on compelling evidence from the data, demonstrating a sophisticated understanding of the experimental results.

Proficient
3 Points

Draws a clear conclusion based on evidence from the data.

Developing
2 Points

Draws a conclusion with limited support from the data.

Beginning
1 Points

Draws a conclusion that is not supported by the data.

Criterion 2

Discussion of Limitations

Identifies and discusses limitations of the experiment.

Exemplary
4 Points

Insightfully identifies and discusses multiple limitations of the experiment, suggesting concrete improvements for future investigations.

Proficient
3 Points

Identifies and discusses limitations of the experiment.

Developing
2 Points

Identifies some limitations of the experiment, but the discussion is superficial.

Beginning
1 Points

Fails to identify or discuss limitations of the experiment.

Criterion 3

Explanation of Implications

Explains broader implications and importance in forensic context.

Exemplary
4 Points

Articulates the broader implications of the findings in the context of the crime scene investigation, demonstrating a deep understanding of the forensic science principles.

Proficient
3 Points

Explains the broader implications of the findings in the context of the crime scene investigation.

Developing
2 Points

Attempts to explain the broader implications, but the connection to the crime scene is weak.

Beginning
1 Points

Fails to explain the broader implications of the findings.

Category 6

Lab Safety & Responsibility

Understanding of lab safety procedures and demonstration of responsible conduct.
Criterion 1

Completeness of Safety Guidelines

The presentation includes all important safety hazards and procedures.

Exemplary
4 Points

Provides a comprehensive presentation outlining all essential forensic lab safety procedures with clear explanations and illustrative visuals, demonstrating a thorough understanding of safety protocols.

Proficient
3 Points

Provides a presentation outlining essential forensic lab safety procedures with clear explanations.

Developing
2 Points

Presentation covers some safety procedures, but may be missing key elements or lack clear explanations.

Beginning
1 Points

Presentation is incomplete and lacks essential safety information.

Criterion 2

Clarity of Presentation

The information is presented in a clear, organized, and engaging manner.

Exemplary
4 Points

Presents safety guidelines in a highly engaging and informative manner, using visuals and clear explanations to effectively communicate the importance of safety procedures.

Proficient
3 Points

Presents safety guidelines in a clear, organized, and informative manner.

Developing
2 Points

Presentation is somewhat disorganized or lacks clarity.

Beginning
1 Points

Presentation is disorganized and difficult to understand.

Criterion 3

Emphasis on Importance

Demonstrates understanding of why safety procedures are important.

Exemplary
4 Points

Demonstrates a deep understanding of the importance of following safety procedures, emphasizing the potential consequences of negligence and promoting a culture of safety in the lab.

Proficient
3 Points

Emphasizes the importance of following safety procedures.

Developing
2 Points

Briefly mentions the importance of following safety procedures.

Beginning
1 Points

Fails to emphasize the importance of following safety procedures.

Reflection Prompts

End-of-project reflection questions to get students to think about their learning
Question 1

How did your understanding of the scientific method evolve through this forensic science investigation?

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Question 2

What was the most challenging aspect of applying the scientific method to the crime scene investigation, and how did you overcome it?

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Question 3

To what extent do you feel confident in your ability to analyze forensic evidence and draw conclusions?

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Question 4

Which of the portfolio activities (Observation Expedition, Question Quest, Procedure Protocol, Data Decoder, Conclusion Chronicle, Safety Sentinel) was the most impactful on your learning, and why?

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Question 5

How has this project influenced your perspective on the role of forensic science in the justice system?

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Question 6

What is one specific lab safety procedure you will always remember and follow, and why is it important?

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