Blood spatter

What can an investigator learn from the analysis of blood spatter?

• Type & velocity of weapon,

  Number of blows, Type of injuries, When the crime was committed, weather death was immediate or delayed 

• who the murder is

• type of injuries, who the murder is, immediate or delayed.

• wipe and swipe

Which one needs goggles?

• all of the above

• Fluroescein

• Luminol

• Presumptive tests

Tags

NGSS.HS-ETS1-3

Which of the following tests' effects last only a few minutes?

• Luminol

• Leuco crystal violet

• all of these

• fluoroscein

Which of the following tests' effects enhances photography?

• Luminol

• Leuco Crystal Violet

• Oblique Lighting (aka alternative light source)

• All of these

Tags

NGSS.HS-PS4-4

Compare a wipe to a swipe.

• A swipe places blood onto a surface, a wipe removes blood from a surface

• A wipe places blood onto a surface, a swipe removes blood from a surface

Which of the following tests are presumptive blood spatter tests?

• Luminol

• Leuco Crystal Violet

• all of these

• Oblique Lighting (aka alternative light source)

• Fluoroscein

  check

Smooth surface

• may cause some splatter, more chaos  

• smooth sphere, more round shape 

Tags

NGSS.HS-PS2-1

Point of convergence

• it is where the parent cell is found

• is the source of the blood spatter 

  the point where the y-axis and x-axis where those lines meet or intersect. 

  tells us where the origin is, tells us where the blood came from. 

• the velocity

• it does not tell us where the blood came from

Cast off

• bloodstain created by sitting

• Bloodstain pattern created when an object is staying still

• bloodstain pattern created when blood is released or thrown from a blood bearing object in motion.

Back spatter

• caused by neck bleeding

• Blood directed forward towards the source of energy or force caused the spatter

• Blood directed back towards the source of energy or force that casued the spatter. 

• Cause from bloody nose, mouth bleeding