(1) LOW FORCE (VELOCITY) IMPACT SPATTER/PASSIVE DROPS:

  • The Blood that falls at the speed or force of normal gravity
  • These spatters usually fall from an open wound, or from a 
    surface that is saturated with blood
  • The majority of the Low Force Impact Spatters are large, 
    circular, spatters with diameters of 4mm or more
  • Low Force Impact Spatters will increase in size as the 
    distance fallen increases, however, the size of the spatters 
    will remain constant after approx 4 feet

 (2) MEDIUM FORCE (VELOCITY) IMPACT SPATTER OR PROJECTED SPATTER

  • Produced with more energy or force than gravity
  • The force of the impact causes the blood to break into 
    smaller size spatters  relative to the amount of  force applied
  • This type of spatter is usually seen in blunt force, stabbings, 
    and secondary spatters
  • Produced when the majority of larger drops of blood are 
    broken into smaller spatters with diameters of 2 – 4 mm
  • The force associated with this type of spatter is greater than 
    25 ft per second

(3) HIGH FORCE (VELOCITY) IMPACT SPATTER

  • Impact spatter that measures less than 2mm in 
    diameter
  • The force necessary to produce this size spatter 
    is greater than 100 ft per second
  • This type of spatter is usually associated with 
    gunshots, explosions, and high speed collisions
  • High Force Impact Spatter takes on a “mist like” 
    appearance

Important to note that the term “Velocity” does not measure the speed at which the blood is travelling. But rather is used to describe or measure amount of force applied to the blood, to cause it to spatter.

(4) The blood trail indicates that whoever was injured was moving towards the door.

Blood Flight Characteristics:  Blood will not break up unless it is acted upon by force. The force must be great enough to  overcome the surface tension of the blood  Blood forms a spherical shape (perfect circular shape) almost immediately upon separating  from the blood source. The spherical shape is caused by the surface tension of the blood.  Surface Tension causes the blood drop to pull itself in; both horizontally and vertically. The blood drop will settle into a spherical shape,  as a result of the surface tension.  The surface tension will maintain the sphere  shape of the blood drop until it impacts with the  surface

image

SPLATTER VS TRANSFER

The simplest type of blood spatter analysis is determining spatters from transfers. Spatters are created when blood is acted upon by force, and travels through the air before landing on a target surface. Transfers occur when a blood source comes in direct contact with a target surface area.

image

Transfer - Wipe Pattern

image

Transfer - Swipe Pattern

image

Spatter Pattern

http://www.crimescene-forensics.com/Blood_Stains.html

http://www.sarti.us/sarti/files/FollowingBloodTrails.pdf

(Source: dreadfulnecrosis)

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