RETURN TO CHANNEL

Search Captions & Ask AI

The science of blood spatter

October 01, 2015 / 02:47

This episode covers blood spatter analysis, including impact spatter, cast off, and transfer staining. The discussion features practical demonstrations of how blood behaves under different conditions.

The host explains impact spatter as the result of force applied to liquid blood, illustrating this by pouring artificial blood and demonstrating the splatter effect. This helps listeners understand how blood can radiate out from a source.

Cast off is discussed next, with the host demonstrating how blood can be flung from a moving object, showing the directionality of the stains created. This is important for understanding the dynamics of a crime scene.

Transfer staining is also covered, where the host describes how a bloody surface can leave marks on a non-bloody surface through contact and movement. This highlights the various ways blood can be deposited at a scene.

The episode emphasizes the importance of conducting experiments to recreate blood patterns, which can help corroborate accounts of events at a crime scene.

TLDR

Blood spatter analysis explained through impact, cast off, and transfer staining demonstrations.

Episode

2:47

00:00:00

I think what's important for us is that our viewers understand each of the terms

00:00:04

because we're talking about these terms in the interviews and I just want to be able to illustrate them okay when we

00:00:09

talk about impact spatter what does that mean impact spatter is force applied to

00:00:15

liquid blood so I'm going to pour some of our artificial blood here into my hand and I'm going to punch it and

00:00:21

that's Force going into a blood Source the force impacts the blood and the blood spatters yes and then the blood

00:00:29

bre breaks up into smaller drops it's impact that's one way blood gets out you can see how it's it's radiating

00:00:42

out we have some smaller stains with some directionality up to the top what's cast off cast is the result of a bloody

00:00:50

object in motion so cast off is if I keep the blood that's on my hand and I my hand like that those larger stains

00:01:02

are in what I would call kind of a linear fashion and they're all going you can see the directionality they're going

00:01:08

up the wall because when you cast off the blood it was moving in an upward Direction yes so we have cast off we

00:01:18

have impact what's the other stains that we were looking at what's transfer staining

00:01:25

so I have a bloody surface coming in contact with a nom blooded surface and then I I move my hand so it's called a

00:01:34

swipe it's a blooded surface with a non-bloody surface with movement and now again I can see something contacted the

00:01:40

wall transfer you have impact you have cast off all different ways in which blood

00:01:49

may end up at the scene yes and each one of these will tell a different part of the

00:01:56

story yes when studied properly I take the size of the pattern the overall location in the room how many stains I'm

00:02:05

seeing their overall distribution the average size of each of those stains all of those come into play the idea of

00:02:13

conducting experiments in which you might cast off blood or try to produce an impact spatter the idea of all of

00:02:21

that is to try to see what kind of fit there is between the stains created the spatter created and the facts of the

00:02:32

account that you've been presented yeah I think it's responsible to conduct experiments in in your scene

00:02:39

and if I can recreate it then I'm putting that as a viable option for how that blood was deposited at the scene

Episode Highlights

Understanding Blood Stains
Exploring the different types of blood stains and their meanings in forensic science.
“Each one of these will tell a different part of the story.”
@ 01m 55s
October 01, 2015

Episode Quotes

Each stain tells a different part of the story.
The science of blood spatter

Key Moments

Impact Spatter00:09
Cast Off00:50
Transfer Staining01:23

Words per Minute Over Time

Vibes Breakdown