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Mugshot would be ideal. I meant to mention that in the Reno and Cowlitz arrest records I obtained there were no mugshots. I asked if they may have them stored separately from the arrest record, but no dice.

I live on the other side of the planet. But would it be considered unusual in the States for those arrest records not to contain mugshots? Not familiar with your protocols over there. Particularly for 40 odd years ago.

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Here is an attached image that compares Jarman's handwriting to the handwriting in The Provence letter. A forensic handwriting expert determined the two sets of handwriting a match with a probability factor of 80% - He added that with more samples from each exhibited handwriting he could possibly raise the percentage of probability.

I'm not a hand writing expert, but I see some similarities, but I also see a difference. the writer of the Cooper letter fails to connect letters, and numbers at the top (T,5,E) while Jarman is neat connecting all his letters, and numbers. I don't see any separation in them. the O & D look similar, but I also make my D's as shown in the Province letter. keep in mind there is no proof to date these letters were ever sent by Cooper. one of the main problems I have is the signing of the letters. one would think he would sign them by Dan Cooper, and not a double alias by using DB Cooper, buts that's my opinion.....

Shutter, yes, completely on board that The Provence letter should not be assumed to have actually been written by the hijacker, mostly posted it to get thoughts as some may find it an interesting consideration. I mostly agree with your thoughts on some individual letters, though the E in Duane is not connected on the top line and the E in Longview not connected in the middle line. 18C, also right on; (there is the B in bend that is not fully connected). The handwriting expert felt that some of these disimilarities could point to two possibilities if the writers were the same: first, based on what he's seen with other cases that the state of mind of the writer being different during the time the writings were made could impact the handwriting; he felt that for instance someone who was sober could have differences than writing compared to while drinking (makes sense), and secondly, he pointed out that some of the E's in The Provence letter were classic indicators of someone attempting to disguise their writing. If this were to be Jarman writing The Provence letter both would seem plausible as he was certainly sober at the time of writing the letter to my mom and the handwriting expert did feel that there were indications the writer of The Provence letter may have been under the influence of alcohol while writing. I think the indications are clear for whoever wrote The Provence letter to attempt to disguise their writing, whether they were really Cooper or not.

This is the way the handwriting expert explained how the 80% probability worked: if you took the handwriting samples of Jarman and 9 other people at random there would be one other person in the group that's handwriting matched The Provence letter as closely as Jarman's did and 8 whose handwriting matched less.

If it were in fact Jarman that wrote The Provence letter, I would personally find it implausible that he were not Cooper. Perhaps there are further ways to determine whether Jarman did - or did not - write The Provence letter; Any ideas on how I might explore that are certainly welcome. Not to jump too far ahead, but of course were Jarman (or for that matter, anyone) to be matched to The Provence letter as well as be identified as the hijacker it would indicate jump survival.