Stepping back a bit, it seems that prosecutors trusted the vendor's statement that the software was "reliable" in the sense that it provided accurate results ev

Stepping back a bit, it seems that prosecutors trusted the vendor's statement that the software was "reliable" in the sense that it provided accurate results every time, a subset of which is that it was tamper-proof. WRONG Not knowing all the details, it seems that no independent regression or red team testing was done on the software, apparently by choice of the PostOffice and prosecutors and by the inability of defendants to gain the resources or clout to do such proof of unreliability, and also apparently due to the closed black-box nature of the software.