[atjoslin]

You can always tell by comparing two of the same letters.

For example, if two lowercase 'e's are exact clones of each other, you know it's a computer font.

[CanSpice]

You didn't read the story, did you?

> The best handwriting machines already vary some letters to avoid seeming too repetitive. Check out "offer" in the third line of that letter above: The "f"s are different from each other. The bot has been programmed to pen that letter a few different ways, the better to fool readers.

[geon]

Even high end handwriting fonts for print has multiple variations of each letter.