Transfer of evidnce
This man came up with the exchange principle
Locard
Evidence from a living thing
Biological Evidence
Not where the crime occured, but a place where evidence is found
Secondary Crime scene
The First officer to arrive at a crime scene
first responder
where arson remains or liquid evidence is stored
an airtight unbreakable container
The exchange principle states that if you come in contact with an object or person:
you are likely to leave something behind
Is DNA direct or indirect evidence? Why?
Indirect, direct evidence is only surveillance footage or eye witness testimony
When taking pictures of evidence, what should be in each picture?
placard and ruler
Why do you separate witnesses or suspects?
avoid bias and collusion
a paper package made to contain small trace evidence
paper bindle
Name 3 pieces of evidence you are likely to leave on your desk
hair, shirt fibers, skin cells, fingerprints, food crumbs, spilled water, saliva
conditional evidence
Name 4 things that should be included in a crime scene sketch?
objects and furniture in the room, evidence, the body, north/south label, scale, key
Forming a hypothesis of the sequence of events from before the crime was committed through its commission
Crime scene reconstruction
A list of the personnel who have handled a piece of evidence
Chain of Custody
your Gardner enters your home, according to Locards principle what 3 things may get left behind?
leaves, dirt, pollen, fingerprints
examples of this include, a hot cup of coffee, or blood outside while it is raining
transient evidence
•May move inward or outward with team members moving in a circular pattern
–Spiral
•Double line search with officers moving parallel to each other and then repeating the sweep from a different direction, making a grid pattern
–Grid
•Officers form a line shoulder and walk through the area searching for evidence
–Linear
•Teams are assigned rooms or small zones for searching
Quadrant/Zone
Name 3 primary responsibilities of the first responder
–Get medical assistance for injured
–Protect scene from unauthorized people and keep a log of all those authorized to visit
–Detain suspects and witnesses
–Perform a preliminary walk-through or crime scene survey- note any transient or conditional evidence
–Note body’s condition and estimate time of death
–Protect physical evidence (fingerprints, hair, fibers)
–Barricades, crime scene tape, interviews
What must be done to properly seal a paper evidence container?
seal it with tape and sign over the tape
What 3 conditions influence the likelihood of exchange taking place?
nature of contact, duration of contact, intensity of contact
Name 4 evidence classifications for a hair
indirect, biological, trace, class, physical
A single hair was found on the back of a couch. The evidence collector placed it in a paper bindle. He then inserted the paper bindle into a plastic evidence bag. Using tape, the evidence collector sealed the bag. After completing the evidence log and the chain of custody form, he brought the evidence bag to the crime lab. What did he do incorrectly?
used a plastic bag instead of paper
What is a control sample and why should they be taken?
•Control samples must also be obtained from the victim for the purpose of exclusion
you find a bullet cartridge at a crime scene. Name the proper procedures to collect, secure and package the evidence
Pick up the cartridge using gloves or a tweezer, place the cartridge in a paper bag, seal with tape and label with signature of collector written across tape Fill out and attach the Evidence log and chain of custody document to the evidence bag