## Description

A series of six DVDs of the Lethal Weapon – DWI Homicide lectures delivered at the National Advocacy Center. Ideal for those who wish to refresh their knowledge of collision reconstruction principles and the presentation of expert testimony at trial. Titles include: Physics Concepts, Time-Distance-Speed Analyses, Speed from Tire Mark Evidence, Drag Factor, Multiple Event Collisions, and Speed from Yaw Mark Evidence.

**Volume I**

Physics Concepts

Physics Concepts

Running Time: 78 minutesChapters:

- Communicating with experts
- Center of mass
- Newton’s Laws
- Lamp Analysis
- Analyzing the statement
- Demonstrating collisions
- Speed and velocity
- Air bag defense
- Head strike speed estimate

**Volume II**

Time-Distance-Speed

Time-Distance-Speed

Running time: 82 minutes

Chapters:

- Time-Distance-Speed
- Basic equations
- Perception-reaction time
- Reaction distance
- Use of assumptions
- PRT used to estimate speed
- Emerging danger defense
- Sight distance
- Acceleration in intersection
- Analyzing a video animation
- Foundation for TDS
- Cross examination

**Volume III**

Speed from Skid Marks

Speed from Skid Marks

Running Time: 113 minutesChapters:

- Introduction
- Speed equation
- Validation studies
- Determining skid distance
- Speed calculations
- Minimum speed estimate
- ABS effects
- Brake efficiency
- Pedestrian slide to stop
- Braking distance
- Demonstrative evidence

**Volume IV**

Drag Factor

Drag Factor

Running time: 93 minutes

Chapters:

- General comments
- Dependence on speed
- ABS drag factor
- Drag sleds
- Attacks on the drag sled
- Skid tests
- Accelerometer use
- Misuse of the accelerometer
- Low drag factor in chart
- Drag factor during rollover
- Drag factor during rotation
- Validation studies

**Volume V**

Conservation of Energy

Conservation of Energy

Running Time: 102 minutesChapters:

- Energy definition
- Conservation of energy
- Combined speeds equation/li>
- Combined speeds testimony
- Speed at intermediate point
- MI v. Rowland case study
- Incorrect applications
- Sample problems
- Crush energy
- Multiple event collisions

**Volume VI**

Speed from Yaw Marks

Speed from Yaw Marks

Running time: 58 minutes

Chapters:

- Introduction
- Yaw mark measurement
- Radius calculation
- Speed equation
- Validation studies
- Caveats and attacks
- Yaw as an energy event
- Speed in a prior curve

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