Crime Scene Science
What type of body fluid's pattern can be analyzed to determine the direction and speed of movement during a violent crime?
Blood pattern
What is toxicology?
The study of poisons and their effects on the body called.
What test is used to detect starch in a substance?
Iodine test
What does forensic entomology study
The study of bugs and decomposition.
What is the first step a forensic investigator must take when arriving at a crime scene?
Secure the scene and isolate clues
Name one way forensic toxicologists gather evidence from a living person.
Hair, urine, or blood
What does a positive fingerprint match require?
Matching ridge details and type
What kind of blood cells help identify blood type?
Red blood cells and their antigens.
What tool is used to collect trace evidence such as hairs and fibers from a surface?
Tape lift or tweezers
What is the difference between a poison and a drug?
A drug is therapeutic; a poison is harmful depending on dose and intent
What type of lab test might help determine if two cloth samples came from the same source?
Fiber comparison under a microscope
How can insects help estimate time of death?
By analyzing their life cycle stage on the body
How can footprint evidence be preserved and documented?
Casting or photography
What test could identify the presence of acids or bases in unknown substances?
pH strip or litmus paper.
If a shoeprint is found at a scene, what part of the shoe is compared to suspect shoes?
What system of the body does immunology study?
The immune system
What is Locard's exchange principle (think about trace evidence)?
It holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic evidence.
What common household chemical can be tested for using a starch-iodine reaction?
Bleach
What kind of analysis compares the band patterns of DNA using a machine.
Gel electrophoresis
Explain DNA extraction
Using detergent, salt, and alcohol to extract visible DNA