Does Brady Apply After a Conviction?

Everyone knows that under Brady v. Maryland, 373 U.S. 83 (1963), a prosecutor must disclose material exculpatory or mitigating evidence to the defense. But does Brady apply only prior to trial, or does the obligation continue after a defendant has been convicted? That’s one of the questions raised by this Washington Post article, which reports that federal Department of Justice officials became concerned about certain practices in the FBI’s forensic laboratory and conducted an investigation, but that while many prosecutors “made swift and full disclosures” of problems documented by the investigators, “many others did so incompletely, years late or not at all.” The United States Supreme Court recently held Brady inapplicable in the post-conviction setting. District Attorney's Office for Third Judicial Dist. v. Osborne, 557 U.S. 52 (U.S. 2009) (holding that the Ninth Circuit “went too far” in applying Brady to post-conviction proceedings, because after a defendant is convicted at a fair trial, he has fewer procedural rights than a defendant who has not been convicted; the Court also stated that Brady is “the wrong framework” for post-conviction proceedings, though it acknowledged that defendants retain some due process rights even after conviction). See also Imbler v. Pachtman, 424 U.S. 409, 427 n. 25 (1976) (stating that “at trial” a prosecutor’s duty to disclose evidence comes from the Due Process Clause, while “after a conviction the prosecutor also is bound by the ethics of his office to inform the appropriate authority of after-acquired or other information that casts doubt upon the correctness [...]