Is There a Difference Between the Signatures on File and the Signature That's on the Envelope?

A signature is innocent until proven guilty, and the law instructs officials basically to look for ways that it could pass. The challenge is that everyone learned cursive in basically the same way. And so if you're looking at it from the perspective of, well, how can I show that this is the same signature? You're going to find similarities because, again, this isn't something that's unique.