Lesson 2: Blood Spatter and Crime Scenes

How can blood spatter be used to reconstruct crime scenes?

Blood spatter
Cast off
Passive
Active
Droplet
Smear

HS-LS3-1: Construct an explanation based on evidence for how the structure of DNA determines the structure of proteins which carry out the essential functions of life through systems of specialized cells.  
HS-LS3-2: Develop and use a model to describe why DNA is inherited from parent to offspring.
HS-LS3-3: Apply concepts of statistics and probability to explain the variation and distribution of expressed traits in a population.
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 constraints, including cost, safety, reliability, and aesthetics, as well as possible social, cultural, and environmental impacts.

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DOK 2: describe different blood spatter patterns.
DOK 2: Explain proper blood evidence collection.
DOK 3: Draw a crime scene sketch containing blood spatter information.
DOK 3: analyze crime scene blood evidence.

Jodi Arias crime scene

All blood is the same.
DNA is only found in blood.
DNA profiling is always 100% accurate.
Forensic scientists always solve the case.
That all DNA is the same, and that it is easy to contaminate.

Visual aids, hands-on activities, and varied reading materials.
Leveled assignments and assessments.
Opportunities for student choice in projects and presentations.
Small group and individual support.

Police report (lab) for blood spatter crime scene.

Simulated blood

Mock crime scene

Blood droplets