Forensic Document Examination – Comprehensive Study Notes

Learning Outcomes

• By the end of this topic, you should be able to:
  • Define major terminologies in forensic document examination (FDE).
  • Identify the various types of documents and case-scenarios encountered in FDE.
  • Examine characteristic features in handwriting and signature comparison.
  • Analyze identifying traits in typewritten, printed, photocopied and other mechanically produced documents.
  • Detect falsification methods such as obliterations, alterations, and erasures using multiple instrumental techniques.

Historical Foundations of Writing

• Writing = permanent / semi-permanent visible messages conveying ideas.
• Earliest media: stone, sticks, wood, ropes, clay tablets, animal skins.
• Pictographs → Ideographs:
  • Cave drawings & petroglyphs ( $20{,}000$ – $10{,}000$ BC ).
  • Adopted by Sumerians, Chinese, Aztecs, Mayas, Egyptians (notably hieroglyphics).
• Alphabetic Leap:
  • Sumerians: first phonetic symbols.
  • Phoenicians: $22$-letter alphabet ( $1700$ – $1500$ BC ), right-to-left, word separation by periods, sentence separation by slashes.
  • Greeks reversed direction, refined characters.
• Cursive Development:
  • Ludovico Arrighi’s italic (Italy, $1522$) → ligatures → modern cursive.
• Modern Alphabetic Systems (cultural distribution): Greek, Cyrillic, Armenian, Hebrew, Arabic, Devanagari-based, Burmese, Korean (designed), Chinese, Japanese, Celtic, Cherokee ( $86$ symbols, invented $1823$ ).

Core Definitions

• Document (Penal Code §$29$): ANY material bearing marks/inscriptions—printed, engraved, pictorial, carved, tattooed, etc.
• Forensic Document Examination (FDE): Application of scientific principles to documents for legal purposes.
• Questioned Document (QD): Any signature, handwriting, typewriting, mark whose source/authenticity is disputed (e.g., checks, wills, passports, suicide notes, lottery tickets).
• Document Expert vs Graphologist:
  • Expert = scientifically trained examiner for authenticity; legally recognized.
  • Graphologist = studies personality; not core forensic science.

Scope of Document Examination

• Handwriting & signature analysis.
• Typewritten, printed & photocopied text comparison.
• Detection of falsifications:
  • Obliterations, alterations, erasures.
  • Ink & paper differentiation.
• Material examinations: inks, toners, papers, ribbons, cartridges, security features.

Common Case Types

• Writings of psychopathic killers during crimes.
• Verification of wills, contracts, deeds, insurance forms, medical records.
• Hold-up / extortion / ransom notes.
• Fraudulent business records, counterfeit bills, bogus cheques.
• Anonymous threatening letters, hate mail (“poison-pen”).

Handwriting & Signature Examination

Underlying Theory

• Uniqueness: No two writers produce identical writing.
• Limits: Age, sex, race, education, personality cannot be determined reliably.

Taught vs Personal Characteristics

• Style Characteristics (copy-book): acquired during early instruction.
• Personal Characteristics: subconscious habits developed over time; create individuality.

Key Examination Principles

• Separate style vs personal traits.
• Distinguish natural vs disguised writing.
• Allow for natural variation—normal, subconscious fluctuation.
• Evaluate total combination & significance of characteristics.

Five Decision Categories (Post-analysis)

1. Normal, unconsciously written.
2. Normal, consciously written.
3. Consciously disguised / controlled.
4. Free-hand imitation (simulation).
5. Traced imitation.

Major & Minor Characteristics ("25-Point List")

• Pen Line Quality / Emphasis.
• Shading / Pressure Variations.
• Skill (fluency, control).
• Movement (finger, hand, forearm).
• Size & Proportion.
• Slant & Slope.
• Form Maturity (letter shapes).
• System: cursive vs print/scriptive.
• Arrangement / Spacing / Margins.
• Pick-up, Terminal & Connecting Strokes.
• Embellishments, Retracing, Alignment.
• Pen Lifts, Patchings, Ticks, Hooks, Spurs.
• Spelling & Choice of Words.
• Instrument Type.
• Placement of Diacriticals (dots, crosses).

Principles Assisting Identification

• Writing is a motor skill acquired by repetition; becomes habit.
• Writers stylize letters based on taught models & personal preference.
• Subconscious habits are difficult to suppress intentionally.
• Handwriting evolves through a lifetime; examiner must consider date of specimen.

Natural Variations

• Legitimate fluctuations in size, slant, spacing, pressure, etc. within the same writer.
• Examiners compare a range of standards to capture these variations.

Disguise

• Definition: Deliberate alteration to hide individuality (e.g., poison-pen letters, suspect dictations).
• Common Techniques: change slant, enlarge/reduce size, alter letter forms, print/block letters, write with opposite hand, invert page, broad-nib pen, vary speed.
• Limitations: subconscious habits often persist; quality usually deteriorates.

Simulation vs Disguise

Categories of Forgery

1. Simulated Forgery: free-hand copy of a genuine model.
2. Traced Forgery: direct tracing, projection, carbon, tracing paper, or guideline indentation.
3. Simple Forgery: writing someone else’s name in forger’s natural style; no imitation effort.
4. Cut-and-Paste: assembling genuine signature fragments.

Typical Forgery Indicators

• Hesitation strokes → ink blobs, broken lines.
• Tremor & poor line quality.
• Patchings / retouching.
• Unnatural pen lifts, backward writing, erasures.
• NOTE: Presence ≠ forgery; absence ≠ genuineness.

Collecting Standards (Exemplars)

• Quantity: $20$–$25$ genuine signatures; $4$–$5$ pages of text. (ASQDE guideline)
• Malaysia (JKM):
  • $10$ collected + $20$ requested signatures.
  • $5$ pages collected + $20$ requested handwriting pages.
• Exemplar Types:
  1. Informal / Collected: naturally written during normal business; contemporaneous ($\le 2–3$ years old).
  2. Formal / Requested: dictated under supervision; similar paper, ink, wording; multiple repetitions; interrupted & varied to foil disguise.

Mechanical & Electronic Document Production

Typewriters

• Common fonts:
  • Pica: $10$ cpi (characters per inch); line-spacing $0.165$-in → $6$ lpi.
  • Elite: $12$ cpi; same line-spacing.
  • Proportional & Metric spacing variants.
• Identification Keys:
  1. Alignment Defects: mis-registration above/below baseline, lateral offset.
  2. Type-Face Defects: chips, breaks, bends → unique letter damage.
  3. Font size & spacing, ribbon condition, impression depth.
• Example: Later-added co-owner name misaligned & lighter → printed after ribbon dried.

Printers & Photocopiers

• Transition from impact typewriters → computer-controlled printers.

Dot-Matrix (Impact)

• $9$-pin vs $24$-pin dot patterns; defects in pins sometimes individualizing.

Inkjet

• Ink droplets via microtubes; feathered / spattered edges. Paper texture influences spatter.

Laser (Electro-photographic)

• Xerographic: drum + toner fused by heat.
• Microscopic appearance resembles photocopy; hard to tell original vs copy.

Comparative Matrix

• Fonts: typewriter (single) vs printer (multiple).
• Margins: typewriter uneven vs printer consistent/right-justified.
• Defects: mechanical wear on typewriters; virtually none on printers.
• Corrections: typewriter lift-off/wite-out vs printer none.

Ink Examination

1. Visual: naked-eye assessment for colour, thickness, instrument type (ball-point, gel, fountain).
2. Spectral (UV/IR):
   • Many blue/black inks absorb UV; IR absorption varies with chromophores.
   • Infrared Photography: sharp images; no specialized gear.
3. Video Spectral Comparator (VSC):
   • Multi-wavelength lighting; software for enhancement & comparison.
   • Modes: IR absorption, UV light, IR fluorescence, transmitted, oblique, etc.
   • Applications: reveal obliterations, differentiate inks, verify security inks.
4. Chromatography:
   • TLC & HPLC separate dye components → comparison to reference library.

Paper Analysis

• Fiber Content: cellulose source, blend ratios.
• Sizing Chemicals, Pigments, Fillers, Coatings.
• Physical Properties: thickness, tensile strength, opacity, reflectance.
• Watermarks & Security Threads.

Electrostatic Detection Apparatus (ESDA)

• Reveals indented impressions $\ge$ several pages below.
• Non-destructive; sensitive to decades-old indentations.

Evidence Handling & Preservation

• Always work on the original when possible (indentations & pressure cues intact).
• If wet, air-dry at room temperature.
• Package flat in plastic sleeves or rigid boxes; avoid folding or stapling.
• Mark only with pencil (initials, report #, date).
• Maintain chain-of-custody: time, place, discoverer details recorded.

Ethical & Practical Implications

• FDE findings can invalidate wills, contracts, financial instruments; profound legal consequences.
• Expert neutrality critical—overstatement of certainty can lead to miscarriages of justice.
• Privacy: collecting exemplars involves balancing rights vs investigation needs.

Real-World Connection: Case Highlight

• Elizabeth Olten Homicide: killer’s macabre journal entry—illustrates how QD examiners link handwriting to suspect, assess psychological state (without claiming personality diagnosis).

Study Tips

• Practice recognizing the 25 characteristics in varied samples.
• Memorize major instrumental techniques (UV/IR, VSC, ESDA, TLC/HPLC) & what each reveals.
• Understand difference between natural variation and forgery indicators.
• Review sample images (misalignment, pin defects, ink feathering) to train visual discrimination.
• Remember numerical guidelines (e.g., $20$–$25$ standards) and spacing metrics (Pica $10$ cpi, Elite $12$ cpi).