I thought the responsibility factor consisted of the collection of the best available evidence by the prosecution before the accused is put on trial at all!!

I'm envisioning more slipshod evidence-gathering under a no-double-jeopardy system, using the logic that "we'll just bring him to trial again when we find some more evidence" (and in the meantime, the public foots the tax bill for each additional trial). Job security for lawyers and judges, decimated income for the middle class – unless a lot of safeguards are put in place (and how likely is that??).