Today’s AssignmentsBlood TypingCreate BSP cards for analysis on Tuesdayheight’s effect on bloodangle’s effect on blood

Homework: “What’s in a Name” due on Tuesday!

Work in groups of 2 Divide up the tasks or you will not finish!

Monday 9/17Learning Target: How does blood spatter

affect a crime?Bellringer: What does blood spatter tell you

about a crime?

Wednesday 9/18Learning Target: How does blood spatter

affect a crime?Bellringer: What does area of convergence

in a blood spatter tell you about a crime scene?

How do you determine sin on your calculator, how do you determine inverse sin on your calculator? What is sin?!

Why did the police suspect the wife did not fall and injure herself

What would they need to find out about the bloodstain on the husbands sleeve to validate their suspicions

Was there other evidence the police could use to prove of disprove the husband’s story?

WHAT BSP’S TELL INVESTIGATORSORIGIN OF THE BLOOD STAINTYPE OF INSTRUMENT THAT CAUSED THE

STAINDIRECTION FROM WHICH OBJECT STRUCK

VICTIMRELATIVE POSITIONS OF

VICTIMASSAILANT/SBYSTANDERS

LOCATION AND MOVEMENT OF PERSONS INVOLVED

NUMBER OF BLOWS OR GUNSHOTSTRUTHFULNESS OF SUSPECT OR

WITNESSES

OOZING, GUSHING AND DRIPPING* EXSANGUINATION

2 WAYS BLOOD LEAVES THE BODY PASSIVE Drips

DEPENDS ON GRAVITYPATTERN IS A RESULT OF GRAVITY ON DROPS

OF BLOODINCLUDES OOZES AND DRIPS

SMALLER CUTS/STAB WOUNDSBLOODY NOSESWEAPONS DRIPPINGWOUNDS THAT WEEP THROUGH CLOTHES

PASSIVE BSP’SFORM BECAUSE OF GRAVITY NOT FORCEGUSHING BLOOD VS. OOZING BLOODBLOOD DRIPS COME FROM ANY ELEVATED

OBJECT DROPS ARE SMALL AMOUNTS OF BLOOD

DROPPING AWAY FROM A LARGER SOURCE Drops don’t break into smaller drops by

moving through the air Why? Surface tension

BLOOD DROPS AS A SPHERE UNTIL IT HITS SOME OTHER SURFACE LIKE THE FLOOR! Swinging arm, edge of a table, weapon

THURSDAYLT: I can describe the different variables

that will affect the size of blood spatterBR: T/F As height increases the diameter of

a passive Blood drop increases?

What is the angle of impact for a drop of blood that is 10mm wide and 33mm long?

Falling DropsStrike surfaces and splash in all directionsSpatters in a circular pattern around the

point of impactShape & size of BSP’s =:

Size of drops (amount)Speed of falling dropsSurface the blood strikesAngle at which blood hits the surfaceHeight from which blood falls

1. PARENT DROP2. SPIKES 3. SATELLITES

Click icon to add picture

1. 2

.

3.

THE SURFACE BLOOD STRIKES

Blood on glass or smooth surfaces would look like this:

Blood on concrete would look like this!

90 ° angle of impactForms even circles around point of impact

10 °angle of impactForms elongated oval patterns with narrow

point aiming in the blood’s direction of travel.

TuesdayLearning Target : I can determine the

different heights of blood spatterBell ringer: what is cohesion, adhesion, and

surface tension of blood?

Terminal Velocity is: themaximum free fall speed of a dropa drop of blood is

ShapeSize

Terminal velocity of blood is: 25 ft./second

So WHAT? Blood reaches that speed after falling from 7 ft.

PROJECTED spatterPERSON OR OBJECT APPLIES SOME FORCE OTHER THAN GRAVITY

ARTERIAL BLOOD SPURTS CAST OFF or IMPACT SPATTERFORCE COULD BE NATURAL

OR EXTERNAL

THE SURFACE BLOOD STRIKES

Blood on glass or smooth surfaces would look like this:

Blood on concrete would look like this!

ANGLE OF IMPACT90 °IMPACT ANGLE 10° IMPACT ANGLE

ELONGATED AND TAILS POINTING IN DIRECTION OF TRAVEL

EVEN CIRCLES AROUND POINTOF IMPACT

ANALYZING PROJECTED SPATTERSWITHIN A SPATTER

WHAT CAUSES SPATTER

BLOOD STAINS VARY IN SIZE AND SHAPE BUT ARISE FROM A SINGLE INJURY

A SINGLE STAIN (pool) IS NOT A SPATTER, BUT A GROUP OF STAINS IS.

STABBINGBEATINGGUNSHOTSARTERIAL

BLEEDINGCAST-OFF BLOOD

SPLASHINGEXPIRATED BLOOD

Additional Terms

Determining point of origin1. find the point of convergence2. Determine the angle of impact3. Find the length of the adjacent side of the

triangle or the length from the top of the blood drop to the center of convergence

4. Convert the length from cm -> mm -> ft you can skip the middle step if you need to

5. Find the point of origin by taking the [tan angle](length of the adjacent side)

The Names of God

JesusLight of the WorldRoot and offspring

of DavidPrecious corner

stone Lamb of God Faithful and TrueThe righteous

judge

Wonderful, counselorPrince of PeaceEternal FatherAlpha and OmegaEmmanuelKing of Kings and Lord of

LordsHealer, helper, brother,

friendSaviorAdvocateHigh Priest

Measure each blood drop in cm on Data Table

Compare data with one other lab group

Analysis of Activity 8-3

cm