>>It does bring into question all prior prosecutions he has prosecuted.<<
That sound you hear is that of all the appeals being typed in prisons around the country. All will contend that the government withheld evidence.
verb (used without object), pettifogged, pettifogging.
1. to bicker or quibble over trifles or unimportant matters.
2. to carry on a petty, shifty, or unethical law business.
3. to practice chicanery of any sort.
I vote for both 2 and 3.