- By: Bart Baggett
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- 07/11/2026
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The most common question attorneys and clients ask me is some version of this: “Can you just look at it and tell?” The honest answer is yes… and sometimes no. A quick look can raise flags. But a proper authentication is a process, not a glance. Here’s what it actually involves.
1. Compare the Signature Against Known Samples
The first step is establishing what the person’s genuine signature looks like, and that means collecting as many authentic examples as possible from a similar time period. Letters, checks, legal documents, passport signatures, bank records, anything we know is genuine.
What we’re not doing is just holding two signatures side by side and saying, “they look the same.” We’re looking for consistent habits: how the person forms specific letters, where they lift the pen, how they connect strokes, the characteristic rhythm of their natural writing. Surface appearance can be mimicked. Those underlying habits are much harder to fake.
The more known samples we have, the clearer the picture. A single comparison sample from twenty years ago gives us very little to work with. Dozens of samples across different time periods give us a defensible baseline.
2. Examine the Writing Characteristics in Detail
Once we have the comparison material, we get into the specifics. Line quality. Pressure distribution. Letter proportions. Spacing between words and letters. The angle and direction of individual strokes. Starting and ending movements.
These are the features tied to neuromuscular habit, the way your brain and hand have learned to coordinate over decades of writing. They’re the features that stay consistent even when someone is signing quickly, signing under stress, or signing years apart. And they’re the features that reveal a forger, because forgers focus on what a signature looks like, not on how it was made.
A traced forgery, for example, often shows hesitation marks, unnatural pen lifts, and a tremor that isn’t present in genuine signatures. A simulated forgery might capture the general shape of a signature while getting the underlying stroke order completely wrong. Both leave evidence. You just have to know where to look.
3. Analyze the Physical Document
The writing on the page tells one story. The page itself tells another.
We examine the ink: its chemistry, how it absorbed into the paper, whether it’s consistent throughout the document. We look at the paper itself for inconsistencies in type or age. We examine pen pressure indentations, which can reveal whether pages were swapped after signing. We look for digital manipulation artifacts, cut-and-paste evidence, and signs that portions of the document were altered after execution.
None of this survives photocopying or low-resolution scanning. This is why originals matter so much. A scanned copy of a forged document looks exactly like a scanned copy of a genuine one. Under a microscope, they look very different. In Miami-Dade probate and civil cases, where high-value estates and real estate transactions are in dispute, the difference between an original examination and a scan-only review can determine the entire outcome.
4. Apply Specialized Equipment and Techniques
Professional forensic document examination uses tools that go well beyond the naked eye. Microscopes reveal ink flow, pen pressure, and line quality at a level of detail that changes what you can conclude. High-resolution scanning captures features invisible to casual inspection. Ultraviolet and infrared light sources reveal alterations, erasures, and additions that were made after the original signing. Digital analysis tools allow precise measurement and comparison of letter forms.
The combination of visual analysis and physical testing is what separates a professional opinion from an educated guess. An opinion built on thorough methodology holds up in court. One built on a quick comparison often doesn’t survive cross-examination.
What Forgeries Actually Look Like
After decades of this work, the signs of a forgery are usually recognizable. Traced signatures show the slow, careful pen movement of someone copying a shape rather than signing naturally. The result is a signature that looks right but feels wrong under magnification. Simulated forgeries often get the general form of a signature but execute the strokes in the wrong sequence. Free-hand forgeries, where a forger practices and attempts to reproduce a signature from memory, almost always reveal inconsistencies in the details that no amount of practice can eliminate.
The forger’s fundamental problem is that they’re consciously trying to reproduce something that the genuine signer does unconsciously. Conscious control introduces patterns that trained examiners learn to recognize.
If you have a questioned signature in a will, contract, deed, or any other document, the process begins with a consultation. Bring what you have and we’ll tell you honestly what can be determined and what it will take to determine it.
Or call us: 1-305-459-1544. Your first consultation is free.
Bart Baggett
Forensic Document Examiner | Expert Witness | Legal Consultant
The Nation’s Leading Forensic Handwriting Expert
CEO, Handwriting Experts Inc.
Frequently Asked Questions
Can you tell if a signature is forged just by looking at it?
Sometimes a quick look raises clear red flags. But a defensible forensic opinion requires a proper examination: comparison against known samples, analysis of writing characteristics, physical examination of the document, and documentation of the methodology. A quick look might tell you something is wrong. A thorough examination tells you why, with evidence that will hold up in court.
What makes a forged signature detectable?
Forgeries almost always reveal themselves through the process of creation, not just the result. Traced signatures show hesitation, unnatural pen lifts, and tremor. Simulated forgeries often capture the appearance of a signature while getting the underlying stroke order wrong. Free-hand forgeries reveal inconsistencies in the details that distinguish conscious imitation from natural habit. The forger is thinking about what the signature looks like. The genuine signer isn’t thinking at all — it’s automatic.
What is the difference between a traced forgery and a simulated forgery?
A traced forgery is created by placing a genuine signature under the paper and tracing over it, or by tracing a projected image. The result often looks visually accurate but shows the telltale signs of slow, controlled movement rather than natural writing: hesitation marks, tremor, and pen lifts in places where a genuine signer would never pause. A simulated forgery is a free-hand imitation practiced until the forger believes it resembles the original. These often capture general form while failing on specific details and stroke sequence.
Why do original documents matter so much for authentication?
Ink chemistry, paper characteristics, pen pressure indentations, and physical alteration evidence all disappear in photocopies and low-resolution scans. A forged document scanned and emailed looks identical to a genuine one scanned and emailed. Under microscopy and physical examination, the differences are often significant and provable. Original documents allow the full range of forensic testing. Copies limit what can be concluded.
What types of cases most commonly involve signature authentication?
Contested wills and estate disputes. Forged real estate deeds and transfer documents. Disputed business contracts. Questioned power of attorney documents. Fraudulent checks and financial instruments. Signed confessions or statements in criminal matters. In Miami, where real estate transactions and probate litigation are both high-volume, signature authentication questions come up constantly.
Can software authenticate a signature, or does it require a human expert?
Software can assist with measurements and comparison analysis, but it cannot testify in court, account for contextual factors, or exercise the kind of professional judgment that authentication requires. Courts require human experts who can explain their methodology, defend their conclusions under cross-examination, and answer questions about the specific characteristics of the document in front of them. Software is a tool. The examiner is the expert.
How long does a signature authentication take?
A straightforward case with good original documents and solid comparison samples can be completed in a week to ten days. More complex cases, or cases where the evidence needs to be located, examined on-site, or supplemented, take longer. Two to three weeks is a reasonable planning horizon for most matters. If you have an urgent court deadline, tell us upfront and we’ll assess whether the timeline is workable.
