From: schuck@fraser.sfu.ca (Bruce Jonathan Schuck)
Subject: Re: PBS SPECIAL
Reply-To: Bruce_Schuck@sfu.ca
Organization: Simon Fraser University, Burnaby, B.C., Canada
Date: Tue, 22 Dec 1992 22:29:37 GMT

grant_jo@ripple.enet.dec.com (Joel Grant) writes:
>In article <schuck.724612776@sfu.ca> Bruck Schuck writes:

>>>If you had read Guinn's analysis, you would know that the fragments
>>>did not match, and that even Guinn admitted that he couldn't tell one
>>>end of a 6.5mm Carcano from another because lead is non-homogenous. He
>>>also pointed out that the JFK head fragments didn't match the count or
>>>weight of the ones tested by the FBI, so I wouldn't count on the
>>>Connally wrist fragments being the original ones either!

>	I've read Guinn's testimony and his report and have 
>	seen it reported on in at least one textbook on forensic
>	science.  You seem to be using (for some reason) Menninger/
>	Donahue, who in turn are quoting some newspaper reporter who
>	apparently didn't quite understand all the details of a
>	fairly complex subject in a few minutes in the hallway
>	after Guinn's testimony to the HSCA.

I read Guinn's report in the HSCA.

>1. The fragments did in fact match.  Guinn found evidence for two
>and only two bullets.  The fragments from Connally's wrist matched
>CE399.  And CE399 was fired from CE139.  The fragments from Kennedy's
>brain matched the large limo fragment (the one without copper)
>that was fired from CE139 as well as smaller ones found in the
>rear of the car.  Between Connally's and Kennedy's body, CE399,
>and the limo fragments, there were two and only two bullets as
>described above.

The fragments didn't match. Some of the trace elements differed by as
much as 1100%. Even silver differed by 25% from the wrist fragments to
CE399. I would hardly call that a match.

>2. Whether or not lead itself is homegenous or non-homegenous
>does not matter to Guinn's analysis.  Guinn's extensive NAA 
>studies of bullets taught him that the three trace elements most
>relevant are antimony, silver, and copper.  

Silver differed by 25%, and Guinn left out all the trace elements
because he chose to. Otherwise he couldn't get a match.

Also he admitted that the JFK head fragments did not match the count
or weight of fragments the FBI did NAA testing on.

>Copper is used in
>Guinn's analysis only on unfired, non-jacketed bullets because
>the firing of a copper jacketed bullet can cause the copper from
>the jacket to "taint" the bullet lead, thus giving false readings.

The jacket of CE399 was undamaged, therefore since there was copper in
the test fragments, the wrist fragments did not come from CE399.

Guinn also noted that he had a hard time telling one end of 6.5mm MC
bullet from the other because lead is non-homogenous.

>Further, Guinn noticed that these bullets, unlike virtually all
>other bullets, varied in antimony and silver composition from
>bullet to bullet, even from the same box.  But they did not
>vary within a bullet.  

Thats not what Guinn said.


>3. Guinn said nothing about the head fragments not matching the
>count of the FBI test fragments.  Two fragments were removed
>from Kennedy's brain, two were tested by the FBI, and two
>were tested by Guinn.  Perhaps the reporter misunderstood
>Guinn's statement that the *fragments of the fragments* used
>by the FBI were gone; Guinn scraped new ones off. 

NAA testing is non-destructive. He didn't scrape any material off the
evidence from the archives, only off of CE399.


>	This means we had absolutely scads of forensic work done
>	at the time, starting with Dallas Police evidence unit
>	supervisors such as Lt. Day and Sgt. Barnes.  

Lt. Day?????

The man who failed to protect the most important fingerprint in US
criminal history? Ha ha ha ha ha ha!

The man who had the rifle for 12 hours , yet claims to have been so
rushed to turn it over to the FBI he didn't protect the fingerprint
with cellophane, which he did for all the other partial prints, and
then passed the rifle on to the FBI without mentioning he had found
Oswalds print?

Ha ha ha ha.



Newsgroups: alt.conspiracy.jfk