Questioned document examination

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In forensic science, questioned document examination (QDE) is the examination of documents potentially disputed in a court of law. Its primary purpose is to provide evidence about a suspicious or questionable document using scientific processes and methods. Evidence might include alterations, the chain of possession, damage to the document, forgery, origin, authenticity, or other questions that come up when a document is challenged in court.


The printer used to print a document can be forensically established using the Machine Identification Code.

Many QDE involve a comparison of the questioned document, or components of the document, to a set of known standards. The most common type of examination involves handwriting wherein the examiner tries to address concerns about potential authorship.

A document examiner is often asked to determine if a questioned item originated from the same source as the known item(s), then present their opinion on the matter in court as an expert witness. Other common tasks include determining what has happened to a document, determining when a document was produced, or deciphering information on the document that has been obscured, obliterated, or erased.

The discipline is known by many names including 'forensic document examination', 'document examination', 'diplomatics', 'handwriting examination', or sometimes 'handwriting analysis', although the latter term is not often used as it may be confused with graphology. Likewise a forensic document examiner (FDE) is not to be confused with a graphologist, and vice versa.

Many FDEs receive extensive training in all of the aspects of the discipline. As a result, they are competent to address a wide variety of questions about document evidence. However, this "broad specialization" approach has not been universally adopted.

In some locales, a clear distinction is made between the terms 'forensic document examiner' and a 'forensic handwriting expert/examiner'. In such cases, the former term refers to examiners who focus on non-handwriting examination types while the latter refers to those trained exclusively to do handwriting examinations. Even in places where the more general meaning is common, such as North America or Australia, there are many individuals who have specialized training only in relatively limited areas. As the terminology varies from jurisdiction to jurisdiction, it is important to clarify the meaning of the title used by any individual professing to be a "forensic document examiner".

Scope of document examination[edit]

A forensic document examiner is intimately linked to the legal system as a forensic scientist. Forensic science is the application of science to address issues under consideration in the legal system. FDEs examine items (documents) that form part of a case that may or may not come before a court of law.

Common criminal charges involved in a document examination case fall into the "white-collar crime" category. These include identity theft, forgery, counterfeiting, fraud, or uttering a forged document. Questioned documents are often important in other contexts simply because documents are used in so many contexts and for so many purposes. For example, a person may commit murder and forge a suicide note. This is an example where a document is produced directly as a fundamental part of a crime. More often a questioned document is simply the by-product of normal day-to-day business or personal activities.

The American Society for Testing and Materials, International (ASTM) publishes standards for many methods and procedures used by FDEs. E30.02 was the ASTM subcommittee for Questioned Documents. These guides were under the jurisdiction of ASTM Committee E30 on Forensic Sciences and the direct responsibility of Subcommittee E30.02 on Questioned Documents. The ASTM Questioned Document Section has been disbanded.

All of the Standards are now available through SWGDOC (The Scientific Working Group for Document Examiners). The Standard Guide for Scope of Work of Forensic Document Examiners indicates there are four components to the work of a forensic document examiner. It states that an examiner "makes scientific examinations, comparisons, and analyses of documents to:

  1. establish genuineness or nongenuineness, or to expose forgery, or to reveal alterations, additions or deletions;
  2. identify or eliminate persons as the source of handwriting;
  3. identify or eliminate the source of typewriting or other impression, marks, or relative evidence; and
  4. write reports or give testimony, when needed, to aid the users of the examiner's services in understanding the examiner's findings."

Some FDEs limit their work to the examination and comparison of handwriting; most inspect and examine the whole document in accordance with this ASTM standard.

Types of document examined[edit]

Documents feature prominently in all manner of business and personal affairs. Almost any type of document may become disputed in an investigation or litigation. For example, a questioned document may be a sheet of paper bearing handwriting or mechanically-produced text such as a ransom note, a forged cheque, or a business contract. It may be material not normally thought of as a 'document'. FDEs define the word "document" in a very broad sense as being any material bearing marks, signs, or symbols intended to convey a message or meaning to someone. This encompasses traditional paper documents but also includes things like graffiti on a wall, stamp impressions on meat products, or covert markings hidden in a written letter, among others.

Historical cases[edit]

Although the crimes were committed before the discipline of document examination was firmly established, the letters of the Jack the Ripper case have since been examined in great detail.


A person who desires to enter a career of forensic document examination must possess certain traits and abilities. The ASTM Standard E2388-05[1] (Standard Guide for Minimum Training Requirements for Forensic Document Examiners) lists several requirements for the "Trainee Candidate".

First and foremost, "an earned baccalaureate degree or equivalent from an accredited college or university" is required as it gives the aspirant a scientific background with which to approach the work in an objective manner, as well as bestowing necessary biological, physical, and chemical knowledge sometimes called upon in the work.

Second, excellent eyesight is required to see fine details that are otherwise inconspicuous. To this end, the aspirant must successfully complete:

  • a form discrimination test to ensure that the aspirant is able to tell apart two similar-appearing yet different items,
  • a color perception test, and
  • near and distant visual acuity tests "with best corrected vision within six months prior to commencement of training."

Beyond the above, additional desirable skills include knowledge of paper, ink, printing processes, or handwriting.


There are three possible methods of instruction for an aspiring document examiner:

  1. Self-education is the way the pioneers of the field began, as there was no other method of instruction.
  2. Apprenticeship has become the widespread way many examiners are now taught. This is the method that is recommended by ASTM in Standard E2388-05.[1] To conform with the ASTM standard such training "shall be the equivalent of a minimum of 24 months full-time training under the supervision of a principal trainer" and "the training program shall be successfully completed in a period not to exceed four years". The training program must also include an extensive list of specific syllabus topics outlined in ASTM Standard E2388-05.
  3. College and university programs are very limited. This is due, in part, to the relatively limited demand for forensic document examiners. It also relates to the need for extensive practical experience, particularly with respect to handwriting examination. It is difficult to include this degree of practical experience in a normal academic program.

There are some distance learning courses available as well. These are taught through a virtual reality classroom and may include an apprenticeship program, a correspondence course, or both.

A trainee must learn how to present evidence before the court in clear, forceful testimony. Fledgling examiners in the later stages of training can get a glimpse into the legal process as well as a better sense of this aspect of their work through participation in a mock trial or by attending court hearings to observe the testimony of qualified examiners. These are guidelines and not requirements.


Examination types[edit]

Examinations and comparisons conducted by document examiners can be diverse and may involve any of the following:

Principle of identification[edit]

The concept of 'identification' as it is applied in the forensic sciences is open to discussion and debate.[2] Nonetheless, the traditional approach in the discipline of forensic document examination is best expressed as follows:

"When any two items possess a combination of independent discriminating elements (characteristics) that are similar and/or correspond in their relationships to one another, of such number and significance as to preclude the possibility of their occurrence by pure coincidence, and there are no inexplicable disparities, it may be concluded that they are the same in nature or are related to a common source (the principle of identification)."[3]

The evaluation of such characteristics is now predominantly subjective though efforts to meaningfully quantify this type of information are ongoing. Subjective evaluation does not mean that the results of properly conducted comparisons will be unreliable or inaccurate. To the contrary, scientific testing has shown that professional document examiners (as a group) out-perform lay-people when comparing handwriting or signatures to assess authorship.[4]

However, this type of 'subjective' analysis depends greatly upon the competency of an individual examiner.

It follows that

  1. an examiner should follow appropriate case examination protocols carefully and evaluate all possible propositions,
  2. an examiner should be properly trained and their training should include adequate testing of their abilities,
  3. the formal case examination procedure should incorporate some form of secondary review (ideally, independent in nature) and
  4. every examiner should make every effort to demonstrate and maintain their competency through professional certification and ongoing proficiency testing.

Handwriting examinations[edit]

The examination of handwriting to assess potential authorship proceeds from the above principle of identification by applying it to a comparison of samples of handwritten material. Generally known as ACE-V, there are three stages in the process of examination.[5]

As Huber and Headrick explain in their text, these are as follows:[5]

  1. Analysis or Discriminating Element Determination:

    The unknown item and the known items must, by analysis, examination, or study, be reduced to a matter of their discriminating elements. These are the habits of behaviour or of performance (i.e., features or characteristics and, in other disciplines, the properties) that serve to differentiate between products or people which may be directly observable, measurable, or otherwise perceptible aspects of the item.

  2. Comparison:

    The discriminating elements of the unknown, observed or determined through analysis, examination, or study, must be compared with those known, observed, or recorded of the standard item(s).

  3. Evaluation:

    Similarities or dissimilarities in discriminating elements will each have a certain value for discrimination purposes, determined by their cause, independence, or likelihood of occurrence. The weight or significance of the similarity or difference of each element must then be considered and the explanation(s) for them proposed.

  4. Optionally, the procedure may involve a fourth step consisting of verification/validation or peer review.

The authors note further that "This process underlies the identification of any matter, person, or thing, by any witness, whether technical, forensic, or not." As such, it is not a formal method, but rather the elements that go into the method.

ASTM has published a standard guide for the examination of handwriting titled "E2290-07a: Examination of Handwritten Items".[1] Some of the guides listed under "Other Examinations" apply to forensic handwriting comparisons (e.g., E444 or E1658).

An alternative guide for the examination of handwriting and signatures has been developed by the Forensic Expertise Profiling Laboratory (School of Human Biosciences, La Trobe University, Victoria, Australia).

Other examinations[edit]

Aside from E2290 mentioned above, many standard guides pertaining to the examination of questioned documents have been published by ASTM International.[1] They include the following:

  • E444-06 Scope of Work Relating to Forensic Document Examiners
  • E2195-02 Terminology: Examination of Questioned Documents
  • E1658-08 Terminology: Expressing Conclusions of Forensic Document Examiners
  • E1422-05 Test Methods for Forensic Writing Ink Comparison
  • E1789-04 Writing Ink Identification
  • E2285-03 Examination of Mechanical Checkwriter Impressions
  • E2286-03 Examination of Dry Seal Impressions
  • E2287-03 Examination of Fracture Patterns and Paper Fibre Impressions on Single-Strike Film Ribbons and Typed Text
  • E2288-03 Physical Match of Paper Cuts, Tears, and Perforations in Forensic Document Examinations
  • E2289-08 Examination of Rubber Stamp Impressions
  • E2291-03 Indentation Examinations
  • E2325-05 Non-destructive Examination of Paper
  • E2331-04 Examination of Altered Documents
  • E2388-05 Minimum Training Requirements for Forensic Document Examiners
  • E2389-05 Examination of Documents Produced with Liquid Ink Jet Technology
  • E2390-06 Examination of Documents Produced with Toner Technology
  • E2494-08 Standard Guide for Examination of Typewritten Items

Not all laboratories or examiners use or follow ASTM guidelines. These are guidelines and not requirements. There are other ASTM guides of a more general nature that apply (e.g., E 1732: Terminology Relating to Forensic Science). Copies of ASTM Standards can be obtained from ASTM International.

Common tools of the trade[edit]

Professional organizations[edit]

Links are provided below

Dedicated to questioned document examination[edit]

  • American Society of Questioned Document Examiners (ASQDE): USA and Canada
  • Australasian Society of Forensic Document Examiners Inc. (ASFDE Inc): Australia/Asia (formerly the Australian Society of Forensic Document Examiners)[6]
  • Associación Professional de Peritos Callígrafos de Cataluña (Spain)
  • European Network of Forensic Handwriting Experts (ENFHEX within ENFSI)
  • European Document Experts Working Group (EDEWG within ENFSI)
  • Southeastern Association of Forensic Document Examiners (SAFDE): Southeast USA
  • Southwestern Association of Forensic Document Examiners (SWAFDE): Southwest USA
  • Gesellschaft für Forensische Schriftuntersuchung (GFS): Frankfurt (Germany)
  • National Association of Document Examiners (NADE)
  • Association of Forensic Document Examiners (AFDE)
  • The International Association of Document Examiners (IADE)
  • The Scientific Association of Forensic Examiners (SAFE)
  • Sociedad Internacional de Peritos en Documentoscopia (SIPDO): Spain, Latin América

General forensic science associations with QDE sections[edit]

Academic/research groups with interest in QDE[edit]


Due to the nature of certification, there are many bodies that provide this service. Most provide certification to individuals from a particular country or geographic area. In some places, the term accreditation may be used instead of certification. Either way, in the present context, it refers to the assessment of an examiner's competency and qualifications by an independent (third-party) organization of professionals.

International (border-less) certifying bodies[edit]

Forensic Science Society (UK)[edit]

The Forensic Science Society (UK) provides their members with the opportunity to obtain a Professional Postgraduate Diploma in forensic disciplines, including Questioned Document Examination.[8] The program is accredited by the University of Strathclyde. Successful applicants are entitled to use the postnominal 'FSSocDip'.

Since membership in the FSS (UK) is open to anyone regardless of where they live or work, this is effectively an international certification.

United States, Canada and Mexico[edit]

American Board of Forensic Document Examiners[edit]

The American Board of Forensic Document Examiners, Inc. (ABFDE) provides third-party certification for professional forensic document examiners from Canada, Mexico, the United States of America as well as Australia and New Zealand.[9] The ABFDE is accredited by the Forensic Specialties Accreditation Board.[10]

Board of Forensic Document Examiners[edit]

The Board of Forensic Document Examiners (BFDE) provides certification of forensic document examiners. The BFDE is accredited by the Forensic Specialties Accreditation Board.[10]

See also[edit]


  1. ^ a b c d ASTM International: These guides are under the jurisdiction of ASTM Committee E30 on Forensic Sciences and the direct responsibility of Subcommittee E30.02 on Questioned Documents. Copies of ASTM Standards can be obtained directly from ASTM International.
  2. ^ In biometrics, this concept is generally referred to as either 'verification' or 'authentication' while the term 'identification' is used to assign an individual to a particular class or group.
  3. ^ Huber, Roy A.; Headrick, A.M. (April 1999), Handwriting Identification: Facts and Fundamentals, New York: CRC Press, p. 84, ISBN 0-8493-1285-X
  4. ^ Kam et al, A Decade of Writer Identification Proficiency Tests for Forensic Document Examiners, ASQDE, 2003.
  5. ^ a b Huber & Headrick 1999, pg. 34.
  6. ^ "ASFDE Inc History". Retrieved 2010-12-30.
  7. ^ "Faculty Spotlight: Dr. Mara Merlino". KSU Campus News. Kentucky State University. 19 November 2013. Retrieved 6 September 2018.
  8. ^ "Qualifications and Awards". UK: The Forensic Science Society. Retrieved 2010-12-30.
  9. ^ "ABFDE Rules and Procedures Guide" (PDF). General qualifications, Para 1.2. A.B.F.D.E., Inc. Retrieved 21 January 2014.
  10. ^ a b "The Forensic Specialties Accreditation Board". FSAB, Inc. Retrieved 11 June 2021.


The literature relating to questioned document examination is very extensive. Publications in English, French, German, and other languages are readily available. The following is a very brief list of English-language textbooks:

  1. Osborn, A.S. (1929). Questioned Documents, 2nd ed. Albany, New York: Boyd Printing Company. Reprinted, Chicago: Nelson-Hall Co.
  2. Harrison, W.R. (1958). Suspect Documents: Their Scientific Examination. New York: Praeger.
  3. Conway, J.V.P. (1959). Evidential Documents. Illinois: Charles C Thomas.
  4. Hilton, O. (1982). Scientific Examination of Questioned Documents. New York: Elsevier Science Publishing Co.
  5. Huber R.A. & Headrick A.M. (1999). Handwriting Identification: Facts and Fundamentals. Boca Raton: CRC Press.
  6. Ellen, D. (2005). Scientific Examination of Documents: Methods and Techniques, Third Edition. Boca Raton: CRC Press.
  7. Morris, R. (2000). Forensic Handwriting Identification: Fundamental Concepts and Principles. Academic Press.
  8. Levinson, J. (2001). Questioned Documents: A Lawyer's Handbook. San Diego: Academic Press.
  9. Köller N., Nissen K., Rieß M. & Sadorf E. Probabilistische Schlussfolgerungen in Schriftgutachten (Probability Conclusions in Expert Opinions on Handwriting), Luchterhand, Munchen (2004) available online in German and English: PDF

External links[edit]