Section508Version - Stain Measurement & Calculating Angles of Impact
By Daniel Feucht
Temp version with colors adjusted for Section 508 compliance
Passenger Vehicle ACMs and PCMs
By Timothy Austin
Video based Learning Object showing passenger vehicle and light duty truck Event Data Recorders (Airbag Control modules and Powertrain Control Modules).
Heavy Truck Electronic Control Modules
This learning object is designed to show students they types of information that can be imaged from the Electronic Control Module employed by heavy truck engines.
Seatbelt Evidence
This Learning Object is designed to identify the various components of a vehicle's seatbelt system, and to show evidence of seatbelt use following a collision.
Sequencing Impacts Using Radial and Concentric Fractures (Screencast)
By Ronald Groffy
Learners examine radial and concentric fractures in glass to determine the sequence of the impacts.
Distance Fallen vs. Stain Diameter (Screencast)
Learners observe how a blood drop in flight continually accelerates and increases in velocity over time. As the drop falls, resistance accumulates. The increase in stain diameter relative to distance of a typical 50 ml drop of blood is represented here. This activity has audio content.
Summary of Bloodstain Evidence Documentation (Screencast)
This activity will summarize the bloodstain evidence documentation process.
Materials for Bloodstain Pattern Mapping, Preservation & Documentation (Screencast)
This learning object describes the equipment and supplies needed to document bloodstain patterns.
Documentation of Bloodstain Evidence (Screencast)
Students will learn how to document bloodstains using roadmapping equipment materials
Forensic Lamp Examination (Screencast)
This learning object is designed to assist students in understanding and interpreting collision evidence found in automotive lamps. In particular, the concepts of Hot Shock, Cold Shock, Hot Break, and Cold Break will be visually addressed.
Stain Measurement & Calculating Angles of Impact (Screencast)
In this learning object the student will learn how to measure a stain and calculate angles of impact. Determining the angle of impact for bloodstains takes advantage of the trigonometric functions (Sine function).
A mathematical relationship exists between the width and length of an elliptical bloodstain which allows for the calculation of the angle of the impact for the original spherical drop of blood.
Given well formed stains we can accurately measure the width and length by simply dividing the stain along it’s major and minor axis. The opposite halves would be generally equal to each other which aids in establishing the impact angle.
Formation of Radial and Concentric Fractures in Glass (Screencast)
in this screencast, learners examine the formation of radial and concentric fractures as an object breaks a pane of glass.
Directionality and Amount of Broken Glass (Screencast)
Visualizes direction and quantity of glass particles as the glass is impacted by a force.
Angles of Impact (Screencast)
This screencast, we see how the shape of a stain defines the angle of impact. In general terms the more circular the stain, the more perpendicular will be the angle at which it struck the surface. The more elliptical the shape of the stain, the more acute the angle will be. With practice and experience, the analyst can recognize the general angle of impact based solely on the shape of the stain.
Surface Tension of a Blood Drop (Screencast)
This screencast shows how blood droplets are held together by a strong cohesive molecular force that produces surface tension in each drop and on the external force. Surface tension pulls the surface molecules of a liquid toward its interior, decreasing the surface area and causing the liquid to resist penetration.
Spatter Drop Dynamics on Impact (Screencast)
In this screencast, the student will learn that regardless of the surface onto which a blood droplet is falling, the angle or velocity at which it does so, or the volume of the droplet, there are four distinct phases involved in the reaction of a moving droplet with impact against a surface.
Using an Evidence Bag
By Joe LeFevre
Explore how to use an evidence bag including how to open it, place items inside, and seal it for the crime lab.
Choosing the Right Fire Extinguisher
By Terry Bartelt, Pat Jensen
Explore the different types of fires and the extinguishers used for each type.
Collecting Biological Evidence
Explore how to collect a fresh or dry blood specimen and prepare it for the crime lab.
Dusting for Fingerprints
Discover how to select the correct fingerprint powder, the proper dusting and collecting techniques, and how to fill out an evidence card.
Using Fire Extinguishers
By the end of this learning activity, you’ll know how to understand, use, and maintain different types of fire extinguishers.
Collection of Entomological Evidence Test
By Amanda Thoma
A crime scene photo for determination of time since death. The student will need to collect the evidence into the correct item.
Collection of Entomological Evidence
Learners view the scene of a suspicious death and select the evidence that needs to be collected.
Freedom of Religion - Supreme Court Case: Lynch v. Donnelly
By Therese Nemec
In this learning activity you'll review the facts and interpretations, determine a verdict, and respond to questions.
Bloodborne Pathogens: Exposure Control Plan
By Terrance Yonash
Learners examine OSHA's guidelines of what to include in a bloodborne pathogen exposure control plan for persons who work in general industry, health care, emergency medical services, law enforcement, education, recreation industries, or other occupations in which there is a potential for exposure to blood, blood products, bodily fluids, or human tissues.