[Barak]

Start looking for someone with their head cocked to the right.

Or somebody that's left-handed. Without guide lines, right-handers tend to wander upward, while left-handers wander downward: it has to do with the arc of the elbow. Try it yourself. Since left-handers are a minority, that might be a significant clue.

[carmody]

They used all upper case letters ... no lower case. It would be interesting if a handwriting expert could offer a profile on the printer.

[Loopy]

What effect, if any, would being a native arabic speaker have on writing in English. They write from Right to Left, No? Wouldn't it be common for such people, writing in English, to make the same stylistic errors such as sloping to one side?

[piasa]

Not true- I'm ambidextrous but when writing as a lefty (and I know a lot of them in the art field)- we slant our writing upwards. (If we slant at all)- most of the time we tip the paper to compensate. Some lefties contort their hand in a weird way up over the top of the line, but not all of us do since ink dries faster these days.... some, like myself, just run their left hand straight across the ink from the side and risk smudges.) We also write the letters with a different order of strokes, or by reversing the direction of the penstroke. In fact, it is in the construction of individual letters where 'handedness' is most likely to show, though if the person has had a drafting class this might alter the old habits. The resolution of the photos, unfortunately, doesn't give us that kind of detail.

[Free Vulcan]

Correct. I'm a lefty, I slant downward without guide rules. Someone also suggested someone used to writing right to left might do the same. Arabic is written rtl