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Bloodshed Interpretation

This course provides the student with the knowledge, skills, and ability essential to the investigation of bloodstain evidence.

The course establishes a foundation of knowledge in the student in the areas of blood dynamics within the body (flow rates, compression and ventilation effects), aggressor-victim behaviors (voluntary and involuntary responses), and wound-weapon correlation (wounds to pattern interpretation).

That foundation is then used to examine and interpret stains in actual cases. Methods of pattern documentation at the scene as well as methods to document interpretations for review will be presented.

During the completion of this course, the student will have encountered and interpreted at least 18 crime scenes with an ever-increasing complexity of interpretive skill levels.  This course stresses realistic demonstrations and pattern interpretation in conjunction with case background information.

Subject Matter Includes:

  • Comprehending the interaction of bloodshed interpretation with reconstruction
  • The appearance of patterns and their origins
  • Surface effects upon a pattern’s appearance
  • Angles, heights, and volumes
  • Velocity of impact versus the energy of “origin”
  • Weapons and the “reservoir effect”
  • Human behaviors in aggression and response
  • Correlating motion to patterns
  • Documenting the pattern evidence
  • Documenting the interpretation
  • Mathematics and blood patterns
  • Simplicity in blood pattern interpretation
  • Practical application to scene investigations

This 40-hour (five day) course is intended to build on the specialized knowledge, skills and abilities acquired by the student during the 60-hour (six day) Crime Scene Investigation and Reconstruction Course and the 50-hour (five day) Advanced Reconstruction And Major Scene Logistics Course.

Course Outline:


  • Establishes foundation in the handling of blood at the scene and details of biohazard precautions. Scene processing revisited…reviewing the basics, pathways to evidence association
  • Critical evidence and scene documentation…the impact of omissions and errors
  • Bloodshed interpretation in crime reconstruction…only a small part of the process.
  • Legal issues surrounding bloodshed interpretation… pitfalls and precautions.


  • This day will provide the student with an awareness of the effects of surface, volume, velocity, energy, angle, height, and sequence affect the interpretation of bloodshed evidence.  Students will be required to perform a series of demonstrative exercises that will satisfy the requirements for the “International Association of Blood Pattern Interpretation”.  Students will also receive a set of photo-documentation of their efforts for later review and reference.


  • Giving movement and meaning to the static demonstrations of the prior day.
  • Correlating behaviors in aggression and defensive response to the creation of patterns.
  • Video analysis of aggressive behaviors and responses.
  • Weapons of aggression and volumes of blood…cast off and droppings


  • Blood-flow dynamics within the body
  • Compression and ventilation as factors affecting bloodshed and patterning.
  • Bloodshed in context with the scene and overall criminal activity
  • Dimensions of the playing field.
  • Documentation
  • Mathematics used in interpretation of bloodshed evidence
  • Simplicity of interpretation


  • Scenarios for interpretation
  • Interpretation and its pitfalls… traps to avoid.
  • The minimums for interpretation
  • Background information to illicit prior to interpretations
  • Testing the training… a practical exam.
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