06-10-2012, 04:41 PM
TRAJECTORY ANALYSIS
TRAJECTORY.ppt (Size: 4.62 MB / Downloads: 109)
“Analysis”
Any type of analysis that we do is based on the scientific method.
The scientific method is a defined process used to resolve complex problems.
Analysis and Crime Scene Reconstruction
In working to establish “what happened,” we are attempting to describe a series of events; however, many times we will not be able to determine everything that happened within that series.
We can only give the best explanation of the series of events based on the data that is available; and we are always open to revising our analysis when presented with new data.
Reconstruction
In Reconstruction, we are trying to put together WHAT happened, not WHY it happened.
In Crime Scene Reconstruction, we only document what can be proven empirically.
based on observation and experimentation
Trajectory Analysis
Analysis of the path of a bullet, while in flight
It’s a snapshot in time
It demonstrates the relationship between a firearm and the target
Terminology
Perforate - to pass all the way through
Penetrate - to enter and stay in
Primary impact - the first impact
Second, third, etc. impacts – impacts after the first
Cautions
Bullets travel in curved lines
However, we approximate the bullet’s path with a straight line
You must consider many things
Ricochets
Deflections
Variations in surfaces
Intervening Objects
The pitch and yaw of moving vehicles
The biomechanics of the human body
Other Cautions
Your knowledge of the firearm
Ejection patterns
Stippling patterns
Powder ammunition loads
Height & weight of the
Shooter(s)
Victim(s)
Not all people fire guns the same way
Training & experience
Furniture & vehicles can be moved