How to Spot Common Types of Document Forgery

In a world that relies on documentation to facilitate transactions, determine identity, and interact with the legal system, it is not surprising that document forgery is becoming an ever-more serious threat. Whether it is a forged signature on a financial agreement, a tampered contract, or a fake identification card, document forgery can cause serious consequences, both financially and legally. 

Billions of dollars are fraudulently lost each year on a global scale as individuals, businesses, and even governments become victims of falsified documents that initially appear to be genuine. The consequences can range from financial fraud and identity theft to contested litigation and criminal offences. 

Forensic document examination is a branch of forensic science that plays an important role in addressing this issue. Forensic document examiners (FDEs) analyse questioned documents to establish authenticity and any signs of tampering. They prevent fraudulent transactions, settle disputes and uphold justice. 

In this blog, we will examine some of the different types of forgeries found in questioned documents, how they are typically accomplished and importantly, how forensic professionals expose and prevent their crimes. Whether you are an officer of the law, a legal professional, or simply someone looking to protect yourself from fraud, understanding document forgery is your first line of defense. 

What Is Document Forgery? 

Document forgery is the intentional act of producing, modifying, or altering a document with the intent to falsely mislead. In most cases the goal of the forgery is to present the document as real to gather a benefit (money, identity, legal authority) or avoid a liability. The forgery may involve a simple handwritten letter or an complex computer file, or even government issued identity documents.  

There are various reasons for people to commit document forgery. Mostly, a person will quickly create funds without authorized access or legally transfer property. It is not uncommon for the forgery to include impersonating another person to overcome a legal or financial difficulty. Other ways to commit forgery can include things like insurance fraud, tax fraud, or falsifying either an educational credential, personal credential, professional credential, etc., or using a document for travel or employment purposes.  

The scope of document forgery is relatively broad, and many documents are susceptible to forgery. Some of the most forged documents are bank checks and statements of bank accounts, identity documents (passports, driver's licenses, or Aadhaar cards), educational degrees, certificates or diplomas, legal documents (wills, power of attorney, or trust documents), employment documents or government documents. Medical prescriptions and receipts are also altered routinely or fabricated.  

In the case of suspected forgery, forensic document examiners (FDEs) are the professionals who examine handwriting and signatures. They examine the source documents and examine to see if the document was forged or modified, if the writing in the questioned document is from the known source, and they will issue an expert opinion regarding the authenticity of the signature. 

Major types of document forgery  

1. Signature Forgery 

Signature forgery is the most common form of document fraud which takes place by replicating or altering someone’s signature without permission. Signature forgery typically tends to be for the purpose of fraud or to gain a benefit, whether it is a financial gain or legal gain. In most cases, signature forgery is used for financial fraud to alter a legal document or create a bogus contract. Forgers use various authentication techniques to replicate someone's signature, and the complexity of each technique can evidently vary. 

There are different forms of signature forgery. For example, simple forgery occurs when a forger writes a random signature of their choice, typically without even trying to replicate the authentic one, and this is often a less skilled way to mislead. Simulated forgery is a third level in the possibility of precision where the forger copies the shape of the authentic signature, and this method may prove more difficult to identify. 
 

Traced forgery is another birth in the forgery landscape, which occurs when a forger takes an original signature and places it under the document to trace over. Traced forgery is easier to identify because the forger infrequently leaves obvious and consistent mistakes when checked under magnification. 

Common examples of documents that have forged signatures are wills and contracts. A forged signature can also significantly impact the amount of time a dishonor of a contract or any similar agreement may impose. 

2. Handwriting Forgery 

Common signs that documents are counterfeit include inconsistencies in fonts, poor printing quality, incorrect formatting, and real documents have security policies in place which include security features such as holograms or microtext. The paper may be of a different weight or feel than the real document, images that make up the document such as seals or logos shouldn’t appear blurry or off-centre in images. 

Detection can include using instruments such as ID scanners, ultraviolet light to check for hidden features, checking a verification system or database for the number or credentials published on a document, and inadvertently checking possible counterfeit documents under magnification which may reveal differences not clearly seen with the naked eye. 

Counterfeiting offences are serious crimes and offenders face certain penalties. Understanding counterfeit documents and practicing full verification of officer identification will minimize your ability to unknowingly contribute to damage involving a fake document. 

6. Digital and Computer-Aided Forgery 

Digital fingerprints have added complexity but can also help identify forged documents since they still leave a fingerprint (or imprint) showing the original document and any digitally created ones. The common use of document creation software like Adobe Photoshop or Illustrator and PDF editors will enable a criminal to create or modify documents. In computer-assisted forgery, criminals can simply scan, modify or replace a signature, alter a date, or create a fake Certificate or ID. 

Forgers may create very believable forgeries, but there is a digital footprint that may accompany the original or altered document. Minor evidence includes not matching fonts, misalignment of elements in the document, or changes in image resolution. Metadata remains in digital files to show either the original file or documentation showing who created it and when it was last saved or modified. 

Forensic experts may use metadata analysis, layer analysis, file comparison tools, document verification along with direct examination to find evidence of any alterations to the original document. Highly specialized forensic software may provide information about changes to structure, updates to documents, and matching documents against original or archived files. 

Digital document or file forgery is now commonplace within the following areas: corporate fraud, academic dishonesty, and/or for criminal use in cybercrime, so it is evident verification of digital documents should now be a part of a forensic examiner's routine work. 

Tools and Techniques used by Forensic Professionals 

Document forensic experts utilize advanced methodologies and scientific techniques to identify fraud when it exists. Their technical tools allow them to identify elements of tampering even if the unaided eye cannot detect alterations. 

The following is a list of some of the most utilized tools when questioned documents are analysed: 

1. Video Spectral Comparator (VSC) 

The Video Spectral Comparator (VSC) is a special machine that helps experts find changes or hidden parts in a document that aren’t easy to see with the naked eye. It works by shining different kinds of light—like UV and infrared—on the paper to show things like different inks, erased words, or extra writing added later. This is useful when checking if documents like IDs, checks, or legal forms have been changed or faked. The VSC can also help see watermarks or hidden security marks in documents. It's a key tool in detecting document forgery and making sure important papers are real and untampered. 

2. Electrostatic Detection Apparatus (ESDA) 

The Electrostatic Detection Apparatus (ESDA) is used to find marks on paper made by writing, even if the writing has been erased or never used ink at all. When someone writes on the top sheet of a pad, the pressure from the pen often leaves faint marks on the sheets below. The ESDA helps bring those marks to light, showing writing that would otherwise stay hidden. This is especially helpful in fraud investigations or cases where someone has tried to cover their tracks. It’s a simple but powerful way to reveal hidden handwriting or prove that a document was changed 

3. Microscopes 

Microscopes are very useful in looking closely at small details on a document. Forensic experts use them to examine how ink was put on paper, how hard the person pressed while writing, and whether the writing looks smooth or shaky. They can also check if the paper was scratched or changed. Microscopes can show if different pens were used or if someone tried to trace or fake a signature. This close-up view helps find signs of forgery or tampering that are too small for the eye to catch. It’s an important step in checking if a document is real or fake. 

4. Ultraviolet (UV) and Infrared (IR) Light Sources 

UV and IR light are used to spot things in documents that normal light can’t show. When a document is looked at under UV or infrared light, certain inks or changes can light up or disappear, showing if something was erased, added later, or written with a different pen. This helps experts find hidden changes in checks, ID cards, or contracts. It’s a safe and easy way to check for document changes or forgery without damaging the original paper. These lights help make invisible details visible and are often the first step in spotting fraud. 

5. Handwriting Analysis Software