Chapter 10 Bloodstain Pattern Analysis Review KEY by 60e8i5O5

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									Chapter 10: Bloodstain Pattern Analysis Review


   1) The amount of spatter from a blood droplet falling on a hard, non-porous surface is _less_ that of a drop
      of blood of equal size, falling from the same distance, onto a softer, porous surface.



   2) The pointed end of a bloodstain always faces:

       The direction of travel


   3) A blood droplet deposited at an angel of impact of about 90o (directly vertical to the surface) will have
      what shape?
      circular


   4) What is the most common type of bloodstain pattern found at a crime scene?

       impact spatter

   5) What is the limitation of the velocity classification of an impact spatter pattern?
      Velocity at which blood strikes a surface by itself cannot illuminate the specific events that
      produced the spatter pattern; in general, one should use velocity categories very cautiously and
      for descriptive purposes only in evaluating impact spatter patterns.

   6) The intersection of straight lines through the long axis of several individual bloodstains in an impact
      spatter pattern illustrates the ___convergence__ of the pattern:


   7) At the crime scene, the string method is used to find the _________ of an impact spatter pattern.
      point of origin

   8) The pressure of the pumping of oxygenated blood out of an injury causes bright red-colored blood to
      spurt out and form what type of pattern?

       Arterial spray patter


   9) Define “blockage” or “void” as it related to blood spatter analysis.

       When an object blocks the deposition of blood spatter onto a target surface or object



   10) When an object with blood on it touches one that does not have blood on it, this produces what type of
       pattern?

       Contact or transfer pattern
11) The approximate drying time of a pool of blood can be used to estimate timing of events at a crime
    scene and is dependent upon what factors?

   Environmental conditions


12) A trail pattern leading away from the victim at a stabbing scene was most likely created by what
    actions?

   An object used to create stabbings by a forward and backward motion

13) Proper location and documentation of bloodstain patterns at the crime scene is the responsibility of:

   investigators


14) How can you ensure that crime scene reconstructions have the best chance of accuracy?

   notes, photos, sketches, and documentations such as a grid method or the perimeter ruler method


15) Crime scene reconstruction requires the piecing together of:

   evidence from combined efforts of medical examiners, criminalists, and law enforcement
   personnel


16) Generally bloodstain diameter ___increases____as a height increases.




17) The _position_of a bloodstain pattern in a three-dimensional space illustrates the position of the victim
    or suspect when the stain-producing event took place.




18) By counting and pairing the patterns of a(n) _similar_ pattern, an investigator can estimate the
    minimum number of blows inflicted upon a victim.




19) Describe the difference between a swipe and wipe bloodstain pattern.

   Swipe - pattern created from an object leaving a bloodstain; bloodied surface rubs against a
           non-bloodied one

   Wipe – pattern created from an object moving thru a bloodstain; non-bloodied surface rubs
                  across a bloodied one

      20) Draw bloodstains dropped at an angle of 10, 40, 70, and 90 degrees.




      21) Explain the effect of each of the following on the shape of a bloodstain.


         Texture of a surface:

         Clean glass or plastic - smooth outside edges
         Rough surface – scalloping edges

         Directionality:

         More acute the angle the easier to determine the direction of travel
         Check for tail

         Angle of impact:

         The more acute the angle, the more elongated the stain




25)      Identify the parts of a bloodstain. Draw a bloodstain and label it.



       Satellite spatter


                                                                               Spines


                                                                               Parent drop

								
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