[bediger4000]

Is the "Mail Isolation Control and Tracking System" ever used to do anything other than decide guilt by assocation?

That is, does the to/from data they collect ever get used to exonerate someone from a crime, or is it just used to decide who to put on "no fly" lists and other such un-American things?

Can this data have any use other than providing guilt by assocation? Can this data be used to say "no, not a terrorist" or something like that?

If it's just one sided, used or useful only for prosecution and persecution, then it needs to be done away with. As it stands, this practice is just Soviet. It's un-American to do guilt by assocation, and to have prosecution evidence that the defendant can't challenge in public.

[anigbrowl]

Prosecutors are required to hand over all evidence to defense counsel on request, and almost invariably do (which is why it's news when a conviction is overturned on the grounds of a prosecutor concealing evidence from the defense). Likewise, a defense lawyer could subpoena this information from the USPS if it was likely to be probative.