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There are 4 types of searches a investigator can conduct whe
Transcript of There are 4 types of searches a investigator can conduct whe
Techniques for collecting & packaging physical evidence
Chain of Custody Procedure
Put evidence in bag
mark the bag with info, case ID and description
seal it and sign the bag and the log
What is the Crime Scene Protocol?
There are 5 main steps:
1.) Interview - Even though the information they receive when having an interview with a victim or anyone involved may not be true, it is important to gain as much information they can to figure out what really happened.
2.) Examine - Investigators examine a crime scene to get a general layout of the crime scene.
3.) Photograph - Photographs are used to record items of possible evidence.
4.) Sketch - A sketch can be drawn at the crime scene when a victim describes their attacker.
5.) Process - the processing is done by the crime scene technician. They process the evidence that was gathered. Both the physical and testimonial evidence.
The different search patterns are:
Different Scene Sketch Methods
How do u conduct a systematic search of a crime scene?
There are 4 types of searches a investigator can conduct when investigating a crime scene. But before deciding on which type of investigation is going to be used, the boundaries of a crime scene needs to be determined.
After that, whoever is conducting the crime scene establishes where to enter and exit the crime scene to make sure nothing is touched to secure not losing any potential evidence.
The investigator then looks around and observes the crime scene to decide on which investigation method would be best for the crime scene they are at. Depending on the size, number of collectors, and location of the crime scene, an investigator will deciding on which search pattern to use.
The investigator will pretty much look for evidence by walking in the pattern you see on the picture on the left.
The investigator/investigators will carefully look for evidence by walking in straight lines throughout the crime scene.
When crimes take place in a large area, (like a football field) this is the search pattern that is used. It is conducted by the group of investigators.
This search pattern can be conducted in a group or individually. You begin to search in one spot and gradually move out like you see on the on picture shown on your left.
Latent Finger Prints
marked in distinctive manner
lifted developed latent should be marked or sealed
photographed ones, marked and scaled
never mark bullets
do not clean bullets
bullets from a body should be air dried and wrapped in paper
submit all bullets
deliver object immediately
allow stain to air dry completely before packaging
do not heat stained material
if not dry place in paper/brown paper bag- box, not plastic
attempt to recover unused ammunition
unfired ammunition should not be marked
It's important to package evidence correctly to preserve everything and so it doesn't become inadmissible.
Rectangular Sketch Method
2 adjacent (touching walls)
measure at right angles
common in outdoor scenes
use straight line measurements from 2 fixed points (creates points)
Triangular Sketch Method
Compass Points Sketch Method
Cross-Projection Sketch Method
Baseline Sketch Method
use a protractor to measure the angle formed by 2 lines
Presents floors and walls as if they were one surface
run a base line to one fixed point to another
measurements are taken from the baseline at right angles
Elements of a Crime Scene Sketch
case ID, so the evidence being sent for testing is accurately given back to the case
date, time, location. so you know how long from the crime it is, where the crime took place so you can further examine it
weather and lighting make sure everything is clear and visible, possibly widen your crime scene area because evidence could have been wasted further out
to see who did what and what their purpose was
dimension of rooms, furniture and exits so you can check for DNA or fingerprints
distance between objects and people
arrow pointing to magnetic north because certain distances need to be accurately recorded
Search and Seizure law
The fourth amendment to the us constitution states that police may engage in reasonable searches and seizures.
An officer must prove that a search or seizure is necessary, if the search is conducted there has to be a possibility that evidence in a crime or stolen items will be found.
In some cases the officer will have to present this information to a judge in order to get a search warrant.
Majority of searches are preformed without warrants
Officers may "seize" items that have no legitimate privacy purpose.
Police may use first hand information to justify the need to search your property
Once a warrant is obtained the police may enter onto the granted area and preform a search for certain listed items.
Police may search areas other than one's not specified if needed. I.E: to make sure everything is safe, stop potential evidence from being ruined or destroyed, to figure out more information on potential and standing evidence.
Officers are allowed to search people and their surrounding area if they are being arrested.
If a police officer believes you are in the possession of a weapon they are allowed to pat you down.