It's hard to say whether it should be surprising that Operation
   Northwoods was committed to paper on government letterhead. An official
   government document proposing terrorism against the American people.
   And throughout history there were 53 admitted false
   flags: [1]http://www.washingtonsblog.com/2015/02/x-admitted-false-flag-
   attacks.html .
   So it becomes fair to wonder what was so big about anthrax, and why
   Matt deHart had to be arrested on trumped up charges.
   On Page 88 of Part 10 of 59 on the FBI's released Amerithrax
   investigation, a psychological profile without letterhead is provided.
   There are also presumably letters from Ivins against fat people near
   the beginning of the PDF file.
   But if the CIA was responsible, would the FBI know, or would they have
   been just doing their jobs? It's a pretty power argument for people
   just doing their jobs when virtually every Nazi gave it as a reason.
   You'd have the BAU giving facially a specific profile, but in reality
   about 1% or so would qualify, so it'd fall under Schneier's arguments
   for no terrorist catching system is effective (although clearly it
   won't be completely automated). Then you'd have field agents under
   pressure to solve the case, they might just be rationalizing why what
   their doing is correct.
   For all it takes for Bruce Ivins to be falsely accused is for the CIA
   to stay mum, and for the FBI to do their jobs?
   In proportion to the punishment, murder convictions are inaccurate, one
   in nine are exonerated based on retested DNA evidence. The CSI effect
   is quite fortunate, or that rate would be higher, the police only
   gather enough evidence to ensure a conviction, not to ensure they don't
   have an innocent person. The probability that OJ was guilty was in all
   fairness, 40%. Another 40% it was Jason. 20% it could've been anyone
   else. Legally, no prosecution for murder should succeed by official
   standards.

References

   1. http://www.washingtonsblog.com/2015/02/x-admitted-false-flag-attacks.html