Sotomayor shows promise.

Absolute Immunity on Trial - Reason Magazine:

"....reading the transcript of the oral arguments in Pottawattamie v. Maghee, heard last Wednesday before the U.S. Supreme Court... The case turns on whether prosecutors who knowingly fabricate evidence to convict an innocent person should be susceptible to lawsuits, or if prosecutors should always have absolute immunity from such suits, no matter how bad their behavior.

During the hearing, Deputy Solicitor General Neal Katyal argued that "if prosecutors have to worry at trial that every act they undertake will somehow open up the door to liability, then they will flinch in the performance of their duties and not introduce that evidence." Katyal made similar statements throughout the hearing: "When someone is introducing evidence at trial, you don't want to chill them in the performance of their duties in any way," and "the overriding interest is protecting the judicial process and not letting information be chilled and not come in." Chief Justice John Roberts underlined that formulation, twice inquiring as to the "chilling" effect of stripping immunity for prosecutors.

It took new Associate Justice Sonia Sotomayor to make the obvious point: We want prosecutors to "flinch" before introducing evidence they suspect might not be true. In fact, we want them to not introduce that evidence at all. And there should be a chilling effect on misconduct as egregious as coaching witnesses to lie. If Brett Grayson had known he could be held liable for his parade of lying jailhouse snitches, perhaps he'd have vetted their stories a bit more carefully, or been more vigilant about ensuring that portions of his case file didn't somehow get passed around the prison system..."