Whether prosecutors have absolute immunity under § 1983 for allegedly fabricating evidence during a preliminary, pre-arrest investigation of an unsolved crime.
Holding
No. Prosecutors receive only qualified immunity, not absolute immunity, when they perform investigative functions normally performed by police or detectives before they have probable cause to arrest a suspect.
Reasoning
Section 1983 contains no express immunity defense, and qualified immunity is the ordinary rule for public officials. Absolute immunity is a narrow exception, available only when the official seeking it shows that the particular function has a firm basis in common-law immunity and is sufficiently connected to the judicial process. The inquiry is functional: it turns on what the prosecutor was doing, not simply on the prosecutor’s title or on where the plaintiff’s injury ultimately occurred.
Under Imbler v. Pachtman, a prosecutor has absolute immunity for initiating and pursuing a prosecution and for conduct intimately associated with the judicial phase of the case. That protection can include professional evaluation of evidence assembled by police and trial preparation after the prosecutor has decided to seek an indictment. But Imbler and Burns v. Reed also distinguish these advocacy functions from administrative and investigative work, for which a prosecutor ordinarily receives only qualified immunity.
Buckley alleged that the prosecutors sought a favorable bootprint expert while working hand in hand with sheriff’s detectives during the preliminary investigation of an unsolved crime. At that stage, the prosecutors did not contend that they had probable cause to arrest Buckley or begin judicial proceedings. Their work was therefore investigative: they were searching for clues and corroboration that might establish probable cause, rather than evaluating an existing case for presentation in court.
The Court rejected the Seventh Circuit’s focus on whether the alleged injury arose during later criminal proceedings. Immunity attaches to the function performed, not to the eventual location or timing of the harm. Likewise, the later use of evidence before a grand jury or at trial cannot retroactively convert earlier investigative conduct into protected advocacy.
No historical common-law tradition gave prosecutors absolute immunity for fabricating evidence during the preliminary investigation of an unsolved crime. It would also be anomalous to give a prosecutor absolute immunity for personally conducting investigative work while Burns affords only qualified immunity when a prosecutor merely advises police about an unarrested suspect. When prosecutors and police perform the same investigative function, they receive the same level of immunity.