Objective In this activity you will gain experience with iris recognition and explore ocular metrics. Learn more by reading Iris Recognition. Equipment Digital Camera Noteboo… Added: April 29, Objective You will gain more experience with face recognition and take measurement of your own face.
The position of cartridges, cartridge cases, and bullets is just as important to the determination of origin as the position of drops of blood. From their placement, it may be possible to deduce the position of firing, the direction of the shot, and in certain cases, the path of the bullet .
The test results often establish or refute claims made by witnesses and suspects. Stringing crime scenes involving shootings where two or more holes are made by one bullet may be feasible to determine the line of fire and the firing position of the shooter.
Such determinations are made by sighting through the holes to trace the line of f light back to the source . The determining of trajectory originated in the realm of the firearms examiner.
The transition from exclusive use by firearms to other areas of crime scene Crime scene investigation body in the began in early with the pioneer work in blood spatter analysis conducted by Professor Herbert L.
MacDonell, who applied the same type of trajectory determination to the new discipline. Professor MacDonell deserves major credit for applying established principles of physics to a new scientific discipline. Geometry applied to ballistics is the same as geometry applied to bloodstains .
Expert Opinion As crime scene investigators, it is possible to track the paths of the bullets; trace their trajectories; and video, diagram, or photograph the results. These are basic interpretations of the scene. Anytime you insert a protrusion rod into a bullet hole to show the trajectory of a bullet, you are rendering an expert opinion as to the direction of travel of the bullet based on your training, knowledge, and prior investigative experience.
Once we enter the area of calculation adjustment; correction for angles of drift, drop-off, deflections; and the position of the body when the shooting occurred, we are entering into areas of expertise, which is usually the area of the ballistics examiner . Tools Necessary for Trajectory Determination Tools necessary for trajectory determination include, but are not limited to, the following: String various types can be used Adhesive tape any kind Measuring tapes 25 ft and roller tape Protractor clear plastic Inclinometer determines angles and slope Compass any E camping type Marking pens Adhesive markers numerical and alphabetical Bubble or torpedo level Laser pointer A crime scene presents the investigator with a specific scenario, such as a shooting, where there may be spent casings present along with one or more bullet impact sites.
The method of operation will depend on the specific circumstances at the crime scene. However, there are some general guidelines to follow: If a vehicle with bullet holes in the windows is involved, swab the interior surrounding the holes for possible gunpowder residue testing.
It may become an issue in the future. Examine the impact site and crater of the glass to visually determine whether the bullet originated from the outside to inbound or from the inside to outbound. Note the location of spiral fractures to determine which impact was first.
Fiberglass rods or wooden dowels steel and aluminum may be too heavy for shattered glass may be inserted into the bullet holes to establish the paths.
String can be attached to continue the path, which can later be verified with the use of the laser light beam. If the hole in the glass is less than two inches in diameter, pass a string through a drinking straw, then attach the string to a small spring that can be inserted through the bullet hole.
A common toothpick can then be inserted through the opposite end of the spring and this allows the string to be pulled tight with light tension .
The string is then attached to the pole at the appropriate level based on the trajectory and laser light indications. When the vehicle string placement is complete and the locations, measurements, and horizontal and vertical angles have been measured, the completed product is photographed and charted by diagram.
It is important to photograph the vehicle from the horizontal plane and to also photograph the stringed angles from the vertical plane via use of a ladder. The combination of the two views complements the diagram and allows both views to confirm each other.
There are certain environmental conditions to consider when conducting trajectory exams.
In the case of a vehicle, tire pressure may be a factor. Measure the pounds of pressure in each tire at the time of the initial forensic examination because tire pressure may leak out after the vehicle has been parked for a long time. A change in tire pressure can affect the results of your determination.Inclusion of an article or a link on the pages of the ph-vs.com in no way represents an endorsement or recommendation of any part of that article or link by Crime Scene Resources Inc., the ph-vs.com, the site's webmaster, or the site's sponsors.
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