Investigation
How does the scientific method apply to Criminal Science Investigation?
Question
Research
Hypothesis
Test
Analyze data
Conclusion
What does direct evidence and circumstantial evidence mean?
Direct involves first-hand observation, circumstantial is left behind at the scene.
There are three things one must prove to define someone as a suspect
Motive
Means
Opportunity
What kind of pet does Rebeca have?
A chihuahua
Police officers do what at a crime scene?
Secure the scene
Separate witnesses
Name five examples of physical evidence
•Fingerprints
•Footprints
•Shoeprints
•Tire impressions
•Tool marks
•Fibers
•Weapons
•Bullets
•Shell casings
The burn test compares how different fibers burn, the differences we see are
Flame size
Speed
Residue
Odor
Loops, whorls and arches
What is the primary scene and a secondary scene?
A crime may have been committed in one location (primary) and the criminals may have moved to a second location to finalize the crime (secondary)
Name three examples of biological evidence
Hair
Plants
Bodily fluids
Natural fibers
Class evidence helps to ______________
Narrow an identity to a group of persons or things
What are latent prints?
perspiration, oils, and amino acids on t skin are transferred into an object, leaving an "invisible" latent print
What is the job of a criminal science investigator?
Document the crime scene, collect physical evidence, record data, sketch the scene, and photograph the scene
Regenerated fibers are different from synthetic fibers in what way?
Regenerated fibers come from cellulose (plants) while synthetic fibers are chemically made.
How are tool marks collected or documented?
Photographs
Measure
Cast
What type of glass is bulletproof glass?
laminated glass
Name at least 5 of the seven S's of crime scene investigation
1.Securing the scene
2.Separating the witnesses
3.Scanning the scene
4.Seeing the scene
5.Sketching the scene
6.Searching for evidence
7.Securing and collecting evidence
Name the three categories of evidence
Trace, class and individual
How is evidence secured when collected?
Packaged, sealed and labeled.
•packaged in a paper bindle
•Placed in a plastic or paper container, sealed with tape and labeled with the signature of the collector
•handling carefully. Must sign a chain of custody log
Bloodstain experts are able to find out
weapon used
directionality
trajectory
timeline