Blood Spatter
This term refers to interpreting bloodstain patterns to recreate the events that caused bleeding.
What is Blood spatter analysis
This test uses a chemical reaction with hydrogen peroxide to turn pink in the presence of blood.
What is Kastle-Meyer test
Investigators have been using blood stain interpretation to recreate crime scenes since this year.
What is 1939
These two main markings on bullets and casings can uniquely link a projectile to a specific firearm.
What are breach block and Striation Markings
The three elements needed for a fire—fuel, oxygen, and heat—are known collectively as this.
What is the fire triangle
One of the first steps in analyzing a suspected bloodstain at a crime scene is confirming this.
What is confirming that the substance is actually blood
This test determines whether blood found at a scene is from a human.
What is the precipitin test
The tail of a bloodstain indicates this important directional detail.
What is the direction the blood was travelling
This residue contains nitrates that can stick to a shooter and help determine firing distance.
What is gun shot residue (GSR)
Investigators look for this pattern to identify a fire’s point of origin.
What is a v-pattern
Blood drops fall as this shape due to the cohesion properties of blood.
What is a sphere
The luminol test works because this component of red blood cells reacts with luminol.
What is iron - in hemoglobin
A blood drop falling from a 90° angle typically shows no tail and is known as this type of drop.
What is a passive drop
The study of bullets and firearms is known as this.
What is ballistics
These animals are specially trained to detect accelerants used in arson.
What are accelerant sniffing dogs
The general rule of blood spatter is that as the energy of the impact increases, the size of the drops does this.
What is decrease
Blood typing is considered this type of evidence because it narrows a suspect pool but cannot identify one specific person.
What is class evidence
Bloodstains can be classified by this factor, which includes high, medium, and low categories.
What is velocity
These spiral impressions inside a barrel cause a bullet to rotate and leave unique markings.
What are lands and grooves
This class B felony (second-highest degree) involves intentionally burning a building that contains a person not involved in the crime.
What is 2nd degree arson
The fastest speed at which free-falling blood drops can travel.
What is 25 feet/second
These are the three major questions serologists must answer when blood is found at a crime scene.
What is:
Is it blood?
Is it human blood?
Can it be associated with an individual?
The point from which blood originated can be determined by analyzing direction, angle of impact, and this third factor.
What is the point of origin
Investigators can determine a shooter’s location by calculating this path using at least two reference points.
What is bullet trajectory
Evidence from suspected arson must be packaged this way to prevent evaporation of accelerants.
What is in airtight containers