The answer is: you don’t!

You hire an expert to spot a forged signature. You hire an expert to go to court, talk to the jury, and confirm whether this is or is not a forged signature—this is a striation, this is a dot, and I’ve been doing this for 20 years.

Some people think they can spot a forged signature and that it’s easy. Sometimes, they literally google how to forge a signature. No one’s going to teach you how to forge a signature because that is a crime, so you’re going to have to attempt to do it on your own.

I could probably write a pretty good article on how to spot a forged signature or how to make a forged signature. I could give a couple of highlights. But I don’t really want to do it. Here’s why: because I don’t want people forging signatures!

People will say, “I’m going to write it really, really slow because if you write it slow, they can’t tell if it’s a forged signature. And I’m going to make lots of pen lifts because if I make lots of pen lifts, and don’t do it really fast—I’ll make a perfect forgery.” And this is the point. You may not know if what I just said was true or not. And I don’t want to tell you because I don’t want people forging people’s names.

I’ve seen people literally walk up to a window and just trace it. Well, that’s a great way to do it—if you want to get caught. It’s not going to come out perfect.

The whole principle of what I do, or what forensic document examiners do, is being able to tell the identity of someone from their handwriting. If that wasn’t true, then you couldn’t do the opposite, which is spot a forgery. So, how do I spot a forgery?

Do you know someone with Alzheimer’s or Parkinson’s? They’re going to have a shaky hand, right? I take that into consideration. But if someone’s 26 and healthy, and you see shakiness in the handwriting, that’s because someone’s writing too slow and they don’t have the fluidity of a pen. The word ‘fluid’ is interesting.

Have you ever ridden a bike? Have you done it in snow? Or dirt? Or mud? It leaves a trail. If you’re going through a mud puddle, do you go really slow or really fast? You’ll go fast. Why? So, you don’t get stuck. What would the pattern of the tire look like if you went as slow as you go but not fall down? If you got a running start going like 14 miles an hour, what would the pattern look like? Probably pretty straight.

Think of this trail as your pen. If it’s super straight, and there’s no quivers or hesitations, then that’s a natural speed, if not a speedy speed. But when someone tries to trace it on a window, they’re going to leave clues—clues of hesitation. There will be a tremor, hesitation, pen lifts, and a lot of other things which are very unconscious that you can’t duplicate unless you’re that person.

I can write my handwriting 16 times. And there’s always going to be a little bit of an ink spot in a certain location because of the angle and the speed I hold my pen. And then, you sign my name. It may look kind of alike, but you’re not going to hold the pen at the same angle. Therefore, the ink is not going to flow at the same angle. It’s also maybe quivering a little bit, and you probably won’t sign it quite as fast as I do.

That’s what biometrics is. When you sign on a pen pad or an iPad, it’s not just about what it looks like. It’s how fast the pen goes. Biometrics is about how far your eyes are away from each other and how long your nose is like on a passport photograph. Biometrics is about how long the B is or  how wide the B is. And more importantly, it is how long it takes to get from point A to point B.

So, if I sign my name Bart Baggett, and I lift my pen between the first and second name, the biometrics computer would know how long I lifted my pen. If you sign my name and you get the first name perfect, but then it takes you like 10 seconds to sign the last name, the computer’s going to think it’s not Bart because he didn’t wait 10 seconds between the names.

So, biometrics is this system of authenticating or determining inauthentic signatures by the time, the pen pressure, and some of the numerical data that electronic pen pads have. And the next generation of forensic document examining will be analyzing digital signatures and digital writing, because the age of the quill pen is long past. It’s like the age of the horse and buggy. Even though we’re still using pens and pencils now, in 30 years it may be a lost art.

So, you still have to determine how people can make their mark. Do you know what that word means: make their mark?

Colloquially, it means to make a splash. Most people in the Middle Ages couldn’t write. They used stamps. Using a piece of coal, they would make a mark as their signature.

Notice that if you sign your name 50 times, you may have different moods. There would be bigger or smaller signatures. They may be angled differently. But, even if you write really small or really large, the space in between the letters, the margins, and stuff will have a range of natural variation. This is a technical term. So, whether you’re in biometrics or writing with a pen and pencil, you’re going to have a range of big, small, sloppy, and not sloppy handwriting depending on your mood.

If you’re not bipolar or you don’t have split personality, you’re not going to have this range of variation that looks like a clown or the writings of 16 different people. We have a book with 16 handwriting samples on the inside cover. Even if you do have good days and bad days, there’s going to be a range of the loops, the size, where the dots go, where the spaces go, and other factors, and within that range is you.

A computer or someone like me who is trained can find this range if we have enough samples. If we are presented with a signature that is outside the range, we’d think that it might be a forgery. That’s the secret of how you discover forgeries. You have to establish that range of variation.

So, here’s a common question: If you want to establish the range of variation, how many signatures do you want?

In geometry and in statistics, you need at least two dots to make a line. And you’ll probably need more than that to even get an average. So, if you’re trying to get a statistically valid set of anything, you’re going to need as many data points as possible. You’ll want at least 10, maybe 20, maybe 500. But the truth is, we don’t really want 500 because that will be a lot of work. Usually within about 30 to 60, you’ve got a decent variation. But again, for a schizophrenic, you’re going to want more samples.

I once said this in court and I wasn’t not lying. I was in San Marino. I said in a hearing, “Well, if it’s a Catholic nun, maybe you could have less, but if it was a drug addict, you’d probably want to have more.” And the judge goes, “Wait a second. I don’t want to insult Catholic nuns or drug addicts in this courtroom. This is the age we’re living in.” She was giggling. She was not being serious. She laughed and I laughed. But the way she said it was like, let’s not insult the nuns or the drug addicts in the courtroom. Obviously, there were no nuns in the courtroom.

It was funny. But it’s true. You think about how you probably don’t need 100 samples of a nun’s writing. They have pretty handwriting. They have a very disciplined lifestyle, so they probably have a pretty predictable mood variations, whereas drug addicts go from the highs, the lows, and all in between. And it would all come out in the handwriting and the unpredictability of one’s signature.

If you want to spot a forged signature, hire a handwriting expert.  Make sure you find someone that’s been to court lots of times, that has done thousands of cases of real handwriting analysis and real forgery detection, and make sure that the judges have court-qualified them. If you got all three of those things in a handwriting expert, you’d probably get a great service at a reasonable cost.

If you want to hire my office, that’s great. Go to handwritingexperts.com. Pick one handwriting experts off of the directory.

Give us a call and we’ll help you out.