In
Imbler v. Pachtman,
I.
Between 2003 and 2006, Dunnica Lamp-ton, the U.S. Attorney for the Southern District of Mississippi, prosecuted Oliver Diaz, a Mississippi Supreme Court justice, and Jennifer Diaz, his wife, for fraud, bribery, and tax evasion. Oliver Diaz was acquitted, but Jennifer Diaz pleaded guilty to tax evasion. Lampton then filed a complaint with the Mississippi Commission on Judicial Performance (the “Commission”) about Oliver Diaz’s conduct. He included copies of the Diazes’ federal tax records obtained during the criminal investigation. 1 The Commission dismissed the complaint in December 2008.
The Diazes sued Lampton in federal court, alleging a violation of 42 U.S.C. § 1983 based on deprivation of rights under 18 U.S.C. § 1905 and 26 U.S.C. §§ 6103 and 7213. 2 Jennifer Lampton also later raised a claim under 26 U.S.C. § 7431. Those statutes prohibit government officials from releasing private tax records obtained in the course of their duties. The Diazes’ suit also included a number of state law claims. Lampton filed a Federal Rule of Civil Procedure 12(b)(6) motion to dismiss the § 1983 claim, arguing that absolute prosecutorial immunity shields his decision to give the tax records to the Commission. The district court denied the motion, 3 and Lamp-ton appealed. 4
II.
We review
de novo
the grant of a Rule 12(b)(6) motion to dismiss.
Martin K. Eby Constr. Co. v. Dallas Area Rapid Transit,
*226
In
Imbler,
A.
At the time of § 1983’s enactment, common-law prosecutorial immunity extended only to “conduct that is ‘intimately associated with the judicial phase of the criminal process.’ ” 8 Absolute immunity did not extend to “‘those investigatory functions that do not relate to an advocate’s preparation for the initiation of a prosecution or for judicial proceedings.’ ” 9 Most immunity cases thus focus on the distinction between a prosecutor’s investigatory functions and advocacy functions related to the judicial process. 10 Lampton, by contrast, asserts that immunity should extend to post-trial conduct instituting a new proceeding before a different tribunal. On its face, that conduct appears to be well outside the bounds of the common-law protection; Conduct undertaken after a federal prosecution is over is not part of the “judicial phase,” and a state ethics proceeding is not part of “the criminal process.”
To support his novel argument, Lamp-ton contends that
Butz v. Economou,
Lampton also points to one case in which a prosecutor enjoyed absolute immunity for post-trial conduct. In
Demery v. Kupperman,
But Demery does not support Lamp-ton’s argument. The prosecutor there was completing his duty under state law to monitor the outcome of the proceeding. His actions were thus related to the litigation over which he had jurisdiction. By contrast, Lampton is a federal prosecutor with no duty to bring complaints before a state ethics commission, and the actions for which he seeks immunity are unrelated to his prosecution of the Diazes. Lampton protests that he would not have had access to the tax records were it not for his role as a prosecutor, but that connection is too tenuous. A prosecutor does not have carte blanche to do as he pleases with the information he can access. He can use it only to fulfill his duties as a prosecutor, and Lampton’s actions went well beyond those bounds.
Lampton’s insistence that he had a duty under the Mississippi Rules of Professional Conduct to report Diaz’s misconduct does not change that conclusion. 14 *228 Lampton could have reported Diaz’s misconduct without releasing the tax records, so his ethical duty did not compel violation of the federal statute. Lampton’s ethical responsibilities did not make the transfer of tax records to a state commission part of his duty as a prosecutor.
In short, Lampton points to no case— and we know of none — extending immunity to post-trial conduct relating to a new action before a new tribunal. Every case extending immunity to post-trial actions involves conduct related to the criminal proceeding that the prosecutor initiated. 15 Lampton cannot claim immunity, because his post-trial actions did not relate to the criminal proceedings and thus are beyond the scope of immunity at common law.
B.
Furthermore, the policies underlying prosecutorial immunity do not justify immunity in this context. The Supreme Court has identified a variety of policy interests behind prosecutorial immunity. First, and of “primary importance,” is the “interest in enabling [the prosecutor] to exercise independent judgment when ‘deciding which suits to bring and in conducting them in court.’ ”
Kalina, 522
U.S. at 125,
That concern is absent here. In the typical immunity case, the prosecutor faces a retaliatory suit (usually for defamation, malicious prosecution, or the like) only if he loses the initial criminal action. Immunity is thus necessary to prevent him from shying away from weaker cases out of fear of liability. By contrast, even if the Commission had ruled against Diaz, Lampton would still face liability. The federal statutes prohibiting release of tax records (unlike state claims for defamation or malicious prosecution) apply regardless of how “strong” is the case against the defendant. There is thus no “prosecutorial discretion” to protect.
Second, immunity lessens the burden of litigation on prosecutors. Without immunity, the “frequency with which criminal defendants bring [retaliatory] suits” would “impose unique and intolerable burdens upon a prosecutor responsible annually for hundreds of indictments and trials.”
Van de Kamp,
Another relevant consideration is “the existence of means other than the imposition of personal liability on the prosecutor to insure that criminal defendants receive fair treatment in the judicial process” and “to deter dishonest prosecutors.”
Morrison v. City of Baton Rouge,
There is, of course, good reason to extend immunity generally to all who report misconduct to state bar ethics committees, and many states have extended absolute immunity to anyone who files a complaint alleging attorney misconduct. 16 Indeed, as a complainant to the Commission, Lamp-ton likely enjoys immunity from the state law claims under Mississippi law. 17 As shown above, however, federal law does not provide immunity to complainants before state ethics committees, because it was not part of the immunity at common law recognized in Imbler. In the absence of congressional action, we should not create that immunity merely because it may be desirable for some policy reason. 18
The denial of Lampton’s motion to dismiss the Diazes’ § 1983 claim is AFFIRMED.
Notes
. The parties have not informed us whether the tax records were introduced in evidence in the criminal proceedings or, if so, whether they were under seal. We therefore assume that those records remained confidential before Lampton forwarded them to the Commission.
. The Diazes filed their claims as a third-party complaint in an action brought by Leslie Lampton, one of the members of the Commission and a distant relative of Dunnica Lamp-ton. Leslie Lampton was seeking a declaratory judgment of immunity from suit by the Diazes. Only the dispute between the Diazes and Dunnica Lampton is at issue in this appeal.
.
Lampton v. Diaz,
. Lampton did not raise, and the district court did not address, other immunities that might be applicable. This opinion thus addresses only the applicability of absolute prosecutorial immunity to the § 1983 claim.
.
Imbler,
.
Id.
at 424,
.
Hoog-Watson v. Guadalupe Cnty.,
.
Hoog-Watson,
.
Id.
(quoting
Buckley,
. For example, a prosecutor's appearance in court in support of a search warrant is protected, but providing legal advice to the police during pretrial investigation is not.
Burns,
.
See Economou,
.
See, e.g., Carroll v. Gross,
.
See Malley v. Briggs,
. As a preliminary matter, Diaz argues that Lampton waived this argument by failing to brief it adequately in the district court. Lampton's memorandum in support of his motion to dismiss did not mention the issue, which he did not raise until his reply memorandum.
The waiver rule exists to prevent an appellate court from “[analyzing] the facts of a
*228
particular [issue] without the benefit of a full record or lower court determination.” 19 James W. Moore et al., Moore’s Federal Practice § 205.05[1], at 205-57 (3d ed.2011) (quoting
Yee v. City of Escondido,
.
See, e.g., Brown v. Cal. Dep’t of Corr.,
.
See, e.g., Drummond v. Stahl,
.
See
Miss.Code Ann. § 9-19-29 (providing that "[a]ll complaints filed [before the Commission] shall be absolutely privileged”). The district court acknowledged that immunity by noting that “Lampton may well have acted as a member of the bar, and there may be some immunities that would therefore attach.”
Lampton,
.
See Buckley,
