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They certainly have "widened" the window of opportunity. I have never felt the day time trip made sense. I find the night time drive much more likely and tox screens should have been done in a post-mortem. On at least two occasions former postal workers have dropped by the threads to offer some thoughts on the postmark issue. This is one of those comments. I lost track of the other but it was similar to this:
Mailman has possible answer
I am a retired mailman from Minneapolis. While I totally agree with Greenwald regarding the Ivins case, I can suggest a possible answer to the time of postmark contradiction.
The mail might not have been collected at or before 5 o'clock. The anthrax letter could have been placed in the box anytime before 5, but if the box is collected after 5, it will bear the next day's postmark.
I can attest to the fact that post boxes are quite regularly collected late. If the carrier who collected the box is still alive, ask him when he emptied the box that day. Or am I missing the obvious, that is, he already has been asked by the FBI?
-- eddy2454
http://letters.salon.com/opinion/greenwald/2008/08/10/anthrax/permalink/5bd13ef4c8d1f8f580250eca05dabf81.html
Personally, I'm not too impressed by the FBI's handling of this case. I don't think I would vote to convict Ivins if I were on a jury but it is difficult to say without hearing both sides. That doesn't mean I am convinced of his innocence but a juror doesn't have to be. The jury must just be convinced of his guilt beyond a reasonable doubt and to a moral certainty.
As time passes, I find the case against Ivins remains the same in my mind (weak) but the FBI needs to do more explaining.