Module 2: Bloodstain Pattern Analysis - Documentation

Degree of significance of blood stain patterns can be compromised by insufficient documentation.

Accurate Measurements and Details
- Measure and document the size, shape, and distribution of individual stains and overall patterns accurately.
- Include measuring devices within photographs for scale reference.
- Take pictures with and without scale for comparative purposes.
Multiple Documentation Mechanisms
- Employ various methods of documentation including:
- Photographs
- Videos
- Diagrams
- Notes
- Ensure overlap in documentation to prevent overlooking significant details.
Overall and Close-Up Photography
- Utilize overall mid-range and close-up macro photography to document bloodstain patterns effectively.
- Overlapping photographs help associate close-up images with their locations in the overall pattern.
Educational Focus
- Aim to educate viewers who were not at the scene through your photographs,
- Illustrate events so that an audience can understand what occurred without prior knowledge.
- Emphasize that more documentation is better; take extra photographs and detailed notes.

Definition: The road mapping technique is a standardized documentation procedure in bloodstain analysis.
Application: Effective for documenting:
- Bloodstain patterns
- Bullet defects
- Trajectory analysis
Basic Photographs Required:
- Overall
- Mid-range
- Close-up
Use of Labels and Scales:
- Introduce labels and scales to act as landmarks in photographs.
- Essential for clarity and avoiding confusion, especially in close-ups.
Conditions for Implementation:
- Road mapping requires a completed primary scene processing.
- It is a supplementary documentation technique, not part of initial crime scene recording.

Luminol and Bluestar:
- Chemiluminescent reagents used as presumptive tests for blood.
- Useful for enhancing impressions on various surfaces and searching for latent blood stains.
- Sprayed technique allows for efficient coverage of large areas; should produce a fine mist to avoid evidence destruction.
Cautions with Luminol/Bluestar:
- Not specific for blood; confirmation through blood species tests and DNA analysis is essential.
- Best used in darkened environments; requires special photographic techniques.
Photography Tips:
- Use wide aperture settings; select color photography over black and white.
- Cameras should be fixed on a tripod with cable release for stability.
- Photograph the area before spraying luminol for comparison with the after-spray result.
Team Requirement:
- Need multiple personnel for effective documentation:
- One for spraying
- One for operating the camera
- One for taking notes
- Dark attire advised to minimize reflection issues.

Statement: The absence of evidence is not evidence of absence.
Understanding Implications:
- Presence of victim's blood on a suspect can link them to a crime; however, lack of blood spatter does not eliminate participation.
- An assailant may not exhibit blood due to:
- Directionality of trauma or blows.
- Covered injury site decreasing exposure.
- Potential cleaning or changing clothing before apprehension.
- Use of protective clothing.
- Removal of clothing prior to the crime.
Evidence Integrity:
- Blood presence at a scene may relate to ongoing bleeding from a living victim or post-death drainage.
- Fundamental to recognize that conclusions in bloodstain analysis should be based on actual stains present, rather than expected evidence.
- Absence of blood on suspects' clothing should not solely lead to exoneration or implication in violent acts.