Chapter 18: Question Documents - Study Notes

Chapter 18: Question Documents

18.1 Documents in an Electronic Society

  • Definition of Questioned Documents (QD): Documents whose authenticity is disputed.
  • Analysis Focus: Includes handwriting, scanners, copiers, inks, printer toner cartridges, and electronic signatures.
  • Famous Case Example: Charles Lindbergh’s baby kidnapping case (1937) highlights the importance of document analysis in forensic science.

18.2 Handwriting Comparison

  • Functions of a Forensic Document Examiner:

  • Habitual and individualized analysis of handwriting.

  • Evaluates handwriting and signatures, typewriters, altering documents, obliterations, and comparisons across various mediums.

  • Collection of Writing Standards:

  • Types of Writing Standards:

    • Non-request writing (spontaneous, un-dictated) is more authentic but less reliable in court.
    • Requested writing occurs under supervision, hence easier to authenticate but may be influenced by the writer’s nervousness.
    • Multiple known writing samples are necessary for comparison (e.g., writing style, utensil).

18.3 Alterations, Obliterations, and Ink Differentiation

  • Types of Fraudulent Writing:

  • Freehand Simulations: Attempt to imitate a person’s signature accurately, focusing on speed, letter formation, pen pressure, and line quality impacts.

  • Tracings: Using an actual document as a guide can show signs of pencil guidelines or uneven lines.

  • Normal Hand Forgeries: Occurs when someone writes using their style but tries to disguise it by changing slant or adding strokes.

  • Electronic Signatures: Analyses principles similar to manual handwriting.

  • Factors Affecting Handwriting:

  • Health issues (e.g., arthritis, stroke) and age can impact writing quality.

  • Substance use can also temporarily affect writing ability.

18.4 Indented Writing

  • Understanding Indented Writing:
  • Impressions left on a secondary sheet due to writing on the top sheet.
  • Detection methods include photographic techniques with oblique lighting or the use of Electrostatic Detection Apparatus (ESDA).
  • Advantages of ESDA: Non-destructive, highly sensitive in capturing indented impressions.

18.5 Photocopiers and Laser Printer Examinations

  • Photocopier Mechanism:

  • How images are transferred from original documents to sensitive cylindrical drums and ultimately to paper.

  • Marks left by the copier mechanism (grabber marks, paper edge depressions).

  • Characteristics of Photocopied Documents:

  • Analysis includes:

    • Identifying marks from the copier mechanism and potential "trash marks" from dirt or scratches.

  • Photocopy Forgery Characteristics:

  • Genuine signatures placed on fraudulent documents through composites.

  • Signs of forgery include alignment issues, varying font sizes, and inconsistent paper characteristics.

Chapter 18 Summary

  • Key Topics:
  • Handwriting analysis techniques and individual characteristics.
  • Identification of various types of fraudulent writing.
  • Understanding photocopy forgery indicators.
  • Overall significance of questioned documents analysis using chemical and instrumental methods, focusing on comparing ink and other materials.