Science Knowledge
Physical things you collect information from at a crime scene
Evidence
Why are fingerprints useful when determining a suspect?
Every fingerprint is unique
True or False?
When looking at animal tracks in snow, the first step to understanding the story they tell is making an inference.
False
What is it called when someone produces a copy of something and tries to pass it off as the original?
Forgery
Found in hair, skin cells, and blood that would be unique to an individual
DNA
A story or interpretation based on evidence
An Inference
A fingerprint on a light surface should be dusted with _________ coloured powder, and a fingerprint on a dark surface should be lifted with ________________ coloured powder
dark, light
What happens to stride length when a person switches from running to walking?
Decreases
What kind of markers separate out into colours the best?
Washable
Characteristics like water absorbency and flammability are used to analyze what?
Fabric samples
Manipulated variable in a paper chromatography experiment
Ink/marker type
A fingerprint pattern in which the ridges start on one side of the finger and finish on the same side
Loop
What feature is most useful when trying to match shoe prints to a suspect shoe?
Wear features (cuts, rubbed off tread)
What does paper chromatography tell an investigator?
What type of marker or pen was used to write something
A person who saw certain events take place and describes what they saw is called what?
An eye witness
What kind of evidence is a scrap of fabric?
Physical evidence
A fingerprint pattern in which the ridges start on one side of the finger and finish on the other side
Arch
3 things a set of shoe prints can tell an investigator
Type of shoe, size of shoe, brand of shoe, speed of travel, direction of travel, approximate height, approximate weight
What are 2 features of a person's writing that can be analyzed?
Form (shape, slant, angle, and curves of the letters),
Lines (thickness of lines or pressure),
Arrangement (layout and spacing of the letters and words across the page)
Content (Spelling, grammar, and punctuation)
Name 3 characteristics that can help classify soil
Soil type, colour, smell, composition, size of particles, pH, texture, interaction with water, magnetic particles
The variables in an experiment that are kept the same
Constant variable
A fingerprint will remain _________ for the life of an individual.
unchanged
What type of track is not useful to figure out the direction of travel?
Tire tracks
What is the name for handwriting analysis?
Graphology
A sketch of a suspect created by an artist based on a witness description
Composite sketch