Prosecutorial misconduct
Prosecutorial misconduct encompasses improper or unlawful conduct by prosecutors in criminal proceedings, often involving actions that prioritize securing convictions over upholding justice and due process.[1] Common forms include withholding exculpatory evidence in violation of Brady v. Maryland, knowingly presenting false testimony, tampering with evidence, and engaging in inflammatory or prejudicial arguments to influence juries.[2][3] Such behavior has been empirically linked to a substantial portion of wrongful convictions; analysis of the National Registry of Exonerations' database of over 2,400 cases reveals prosecutorial misconduct in approximately 30% of exonerations, frequently alongside other official errors.[4][5] The ramifications extend beyond individual miscarriages of justice, eroding systemic integrity by fostering incentives for "win-at-all-costs" prosecutions driven by political ambitions and performance metrics, while doctrines like absolute immunity often shield perpetrators from meaningful repercussions.[6][7] Despite its prevalence in documented exonerations—where official misconduct, including by prosecutors, factors into over half of cases—accountability remains elusive, with sanctions imposed in only a fraction of instances due to high evidentiary burdens and institutional protections.[8][9]Definition and Legal Framework
Core Definition and Elements
Prosecutorial misconduct constitutes any unethical, illegal, or improper action by a prosecutor in the course of a criminal prosecution that undermines the integrity of the judicial process or deprives the defendant of a fair trial. Unlike routine prosecutorial errors, which may stem from oversight or good-faith disagreement, misconduct involves deliberate or reckless deviations from the prosecutor's core duty to pursue justice impartially, as opposed to securing convictions at any cost. This principle traces to the U.S. Supreme Court's ruling in Berger v. United States (1935), which held that while prosecutors may "strike hard blows," they may not "strike foul ones" by employing methods that pervert the truth or prejudice the accused unfairly.[10] The misconduct typically implicates due process protections under the Fifth and Fourteenth Amendments, rendering trials fundamentally unfair when it influences verdicts or sentencing.[11] Central elements of prosecutorial misconduct include:- Improper methods or tactics: Engaging in conduct that violates professional ethical standards, such as those codified in American Bar Association Model Rule of Professional Conduct 3.8, which mandates prosecutors to refrain from initiating charges lacking probable cause, to disclose all exculpatory or impeaching evidence (per Brady v. Maryland, 1963), and to avoid extrajudicial statements that heighten public condemnation of the accused.[12][13]
- Culpable mental state: Courts generally require proof of knowing, intentional, or reckless behavior rather than mere negligence, though certain due process violations—like suppression of material exculpatory evidence—trigger liability irrespective of intent if the evidence could have affected the outcome.[13][11]
- Prejudice to the defendant: The misconduct must have a substantial likelihood of altering the trial's result, as assessed under harmless error doctrines; isolated remarks or minor lapses may not suffice for reversal absent demonstrated harm.[14]
- Violation of constitutional or statutory norms: Actions infringing rights such as the right to confront witnesses, present a defense, or receive impartial jury instructions, often evaluated for systemic impact on trial fairness rather than isolated prosecutorial zeal.[15]