Nuevos analisis de explosivos

[pepelui]

Durante el juicio por el atentado de Oklahoma tambien se pregunto :

Steven Burmeister - Redirect
laboratory from the crime scene for nitroglycerin?
A. I would say 90 percent of the items that came in were
tested for nitroglycerin.
Q. Is nitroglycerin -- are polyethylene bags permeable for
nitroglycerin?
A. Yes, they would be.

http://www.courttv.com/archive/casefiles...202am.html


Mas aun, esta vez con EGDN:

Q. Now, we've talked generally about background contamination
in a lab. You're familiar with the testimony regarding the



John Lloyd - Direct
packaging of Mr. McVeigh's clothes, are you not?
A. Yes, I am.
Q. And what is your opinion about the way in which those
clothes were packaged? Is that forensically sound or not?
A. It is not forensically sound.
Q. Why?

A. They were packaged in paper, which was -- it's permeable to
some explosives, as has already been described. I understand
the bag wasn't sealed. It seemed to have just been folded over
at the top.
Q. What's wrong with that?
A. It isn't airtight, so that particulate matter can go in and
out.
Q. What about plastic Ziploc bags?
A. For explosives such as ethylene glycol dinitrate, EGDN, and
nitroglycerine, they are totally unsatisfactory.
Q. Why?
A. Because the polythene of which they're made is permeable to
such explosives. One can show that -- very easily that
explosives can permeate those bags within a matter of hours.
Q. Now, if we place -- if we're going to use the paper bag,
should we place all of the clothes in the same bag?
A. Well, if you so wish. If you're interested in examining
the residues on any particular article of clothing, then
clearly that is not an acceptable practice.

http://www.rdono.com/US/9703/okc.trial/t...97.eve.txt


Recomiendo su lectura por analogias con la historia de las contaminaciones. Pero resumiendo las bolsas de polietileno son permeables a la Ng y al DNT. Existe documentacion cientifica y se ha mostrado en juicios.

Saludetes