Opinion for the Court by Circuit Judge ROGERS.
Upon his arrest for federal drug offenses, Antoine Jones was confined pending trial at the Central Detention Facility (hereinafter “D.C. Jail”). When the U.S. Attorney’s Office discovered that Jones might be a threat to various individuals, it sought to have him placed in protective custody. When the prosecutor assigned to Jones’ criminal case learned that Jones was continuing to make telephone calls, she instructed jail officials to place Jones “in lockdown until further notice.” Jones remained in “lockdown” from December 2, 2005, without mail or telephone or visitor privileges until April 26, 2006, when the district court ordered Jones returned to the general population at the D.C. Jail subject to certain restrictions on his mail, telephone, and visitor privileges.
Jones, acting pro se, sued the prosecutor, the acting warden of the D.C. Jail, and the detective from the Metropolitan Police Department who prepared an affidavit in support of a search warrant for his cell. He alleged that they had violated his rights under the First, Fifth, Sixth, Eighth, and Fourteenth Amendments to the United States Constitution. The district court dismissed the complaint pursuant to Rule 12(b)(6) of the Federal Rules of Civil Procedure for failure to state a claim upon which relief can be granted against the prosecutor and the acting warden; it dismissed the complaint against the detective as conceded when Jones did not respond to the detective’s motion to dismiss. Jones appeals. For the following reasons, we affirm.
I.
The investigation by the Federal Bureau of Investigation (“FBI”) and the events leading to Jones’ arrest on October 24, 2005 and his indictment for drug conspiracy and related offenses are described in the case bearing the name of his codefendant,
United States v. Lawrence Maynard,
According to the complaint, the prosecutor assigned to Jones’ criminal case (hereinafter “the prosecutor”) “telephoned the DC[ ] Jail and verbally told the Administration to remove me from general population and place me in segregation under Total Separation (T.S.) Status ... [and] not be allowed social visits, telephone calls and that my mail be withheld from me.” Compl. at 1. Attached to the complaint were various documents, including a December 22, 2005 memorandum from the prosecutor to the acting warden. 1 It re *593 counted that the prosecutor, after learning that Jones was continuing to make telephone calls and was apparently still in the general population, sent a memorandum to the D.C. Jail on December 2, 2005 stating: “Antoine Jones, DCDC 24912 should [be] placed immediately in lockdown at the D.C. Jail. Please ensure that Mr. Jones is [in] lockdown until further notice.” In the December 2, 2005 memorandum the prosecutor also advised the acting warden that she was renewing this request “to ensure the safety of various individuals, and the integrity of the investigation.” Jones was removed from the general jail population on or about December 2, 2005 and placed in “Total Separation” status, with restricted telephone and mail privileges. In the December 22 memorandum, the prosecutor advised the acting warden that call logs showed Jones had continued to make telephone calls after he had in fact been placed in Total Separation status, which “underminefd] the purpose of his being in that placement.” Additionally, the prosecutor wrote: “Please consider this memorandum a formal request for an immediate investigation into this situation, to include an examination of how these clear violations occurred, and more importantly, an immediate correction of the problem.” Jones was thereafter denied any social visits, telephone and incoming mail privileges.
On February 26, 2006, defense counsel in Jones’ criminal case filed a motion for modification of the conditions of Jones’ pretrial detention. Jones’ Housing Board hearing on December 15, 2005, and administrative housing grievances filed on January 20, 2006 and February 10, 2006, had provided no relief as he was informed by memorandum from the acting warden that the restrictions were imposed at the request of the U.S. Attorney’s Office. In the motion, defense counsel argued that there had been improper interference with the attorney-client relationship and that the restrictions were punitive. The list seized from Jones’ cell, according to defense counsel, had been prepared at defense counsel’s request for a list of persons who may have information regarding Jones’ criminal case; since the seizure defense counsel had told Jones not to write anything down. Defense counsel also argued that the restrictions were unnecessary to ensure the internal security at the D.C. Jail or to effect Jones’ presence at trial, and further that the conditions of Jones’ confinement did not appear to be reasonably related to a legitimate governmental objective, but “appear to be solely punitive in nature and thus violate [Jones’] due process rights.” Motion for Modification of Detention Conditions at 2-3, United States v. Jones, No. 05-386 (D.D.C. Feb. 26, 2006), ECF No. 76.
The U.S. Attorney’s Office opposed the motion, pointing, in part, to a telephone call in which Jones revealed to a girlfriend that he was attempting to locate a “coconspirator who had been incarcerated in early October on other charges but not yet indicted in [Jones’] case,” and to a letter written from the girlfriend divulging the location of the co-conspirator in the D.C. Jail and reporting that another individual was “on the street.” Government’s Response to Defendant Jones’ Motion for Modification of Conditions of Detention at 2, United States v. Jones, No. 05-386 (D.D.C. Mar. 16, 2006), ECF No. 85. The U.S. Attorney’s Office also pointed to a list of names recovered from Jones’ cell that “appears to be a list of individuals Jones suspects are government witnesses.” Id. *594 at 1-2. In a subsequent filing, the U.S. Attorney’s Office noted that Jones attempted to use his wife and a second girlfriend to contact Maynard who was at large. Additionally, the U.S. Attorney’s Office mentioned housing Jones outside of the District of Columbia in Orange or Northern Neck, Virginia. Id. at 3. Defense counsel objected that moving Jones to such a distance would place an undue burden on defense counsel as well as Jones’ friends and family, and would not alleviate the U.S. Attorney’s Office’s concern stemming from Jones’ communications with persons in the community.
On April 24, 2006, the district court in the criminal case granted the motion to modify Jones’ pretrial detention conditions “insofar as [Jones] should no longer be in total lockdown.” To address the concern of the U.S. Attorneys’ Office, the district court also ordered that Jones’ telephone calls be recorded and his mail monitored (except for telephone calls and mail from his defense counsel and criminal investigator), and social visits be limited to his wife, defense counsel, and the criminal investigator. Order, United States v. Jones, No. 05-386 (D.D.C. Apr. 24, 2006), EOF No. 111.
On June 8, 2007, Jones, acting pro se, filed a complaint pursuant to 42 U.S.C. § 1983, alleging the violation of his constitutional rights under the First, Fifth, Sixth, Eighth, and Fourteenth Amendments. 2 The complaint alleged: (1) The denial of his right properly to prepare his defense to the criminal charges, including being denied by a D.C. Jail case manager the right to telephone defense counsel and to have access to legal and writing materials. (2) The denial of his right to the free exercise of his religion while being held in Total Separation status. (3) The denial of due process by the prosecutor and the D.C. Corrections Department officials who “conspired and stripped” him of his pretrial detainee due process social visits, and telephone and mail privileges. Jones claimed emotional suffering as a result of losing ties with his family and business associates, and that the prosecutor’s interference with his access to witnesses denied him the right to a fair trial. He also claimed that the interception, copying, and reading of his mail without a warrant violated his prison rights. (4) Subjection to a health hazard, while being housed in the S-l Unit, as a result of human urine and feces on the bars and walls, rodent infestation, cold temperatures, and bright lights 24 hours a day. (5) Discrimination by the prosecutor and the D.C. Jail and other staff by being held in his cell 24 hours a day 4 days a week and 23 hours a day 3 days a week; outside his cell he was strip searched, handcuffed, in shackles and belly chain, and his cell was searched each time he left it. Jones claimed that the physical housing segregation and isolation as a result of being denied privileges, in addition to being “discriminated against, punished, violated, humiliated and degraded,” and complained that his segregation status was “used as a pretext for punishment [and] torture.” Compl. at 1, 6. He further *595 claimed that “the Prosecutor(s) acted outside them realm of jurisdiction in instructing the DC[ ] Jail Administration to place [him] in the T[otal] Segregation] status and the DC[] Jail Administration acted outside their realm of jurisdiction by carrying out such an order without a properly signed court order from the judge.” Compl. at 7. Jones sought monetary damages of $1,000,000, the disbarment of the prosecutor, and the demotion or suspension of the responsible D.C. Jail officials.
The district court dismissed the complaint against the prosecutor pursuant to Rule 12(b)(6) for failure to state a claim upon which relief can be granted.
Jones v. Lieber,
II.
On appeal, Jones, aided by amicus,
3
contends that his
pro se
complaint stated plausible claims of unconstitutional punishment by the prosecutor and the acting warden in view of his lengthy solitary segregation and “other extreme measures” he suffered at the D.C. Jail. He maintains that the affirmative disabilities or restraints imposed upon him have historically or practically been regarded as punishment for prisoners in correctional facilities, citing
Sandin v. Conner,
This court reviews
de novo
the dismissal of a complaint pursuant to Rule 12(b)(6) for failure to state a claim upon which relief can be granted.
Atherton v. D.C. Office of the Mayor,
To survive a motion to dismiss, a complaint must contain sufficient factual matter, accepted as true, to state a claim to relief that is plausible on its face. A claim has facial plausibility when the plaintiff pleads factual content that allows the court to draw the reasonable inference that the defendant is liable for the misconduct alleged. The plausibility standard is not akin to a probability requirement, but it asks for more than a sheer possibility that a defendant has acted unlawfully. Where a complaint pleads facts that are merely consistent with a defendant’s liability, it stops short of the line between possibility and plausibility of entitlement to relief.
Id.
at 1949 (internal quotation marks and
*596
citations omitted).
4
A
pro se
complaint “must be held to less stringent standards than formal pleadings drafted by lawyers,”
Erickson v. Pardus,
A.
The premise of Jones’ complaint is that a government interest in preventing witness tampering falls outside the interest identified in
Bell v. Wolfish
as sufficient to deprive a pretrial detainee of due process protections, namely ensuring conditions necessary for internal security at the D.C. Jail and to effect his presence at trial,
see id.
at 536-37,
“The doctrine of qualified immunity protects government officials ‘from liability for civil damages insofar as their conduct does not violate clearly established statutory or constitutional rights of which a reasonable person would have known.’ ”
Pearson v. Callahan,
In
Saucier v. Katz,
Jones’ complaint alleges that the prosecutor requested only certain deprivations. Specifically, it alleges that she requested he be “remove[d] from [the] general population and place[d] in segregation,” and that he “not be allowed social visits, telephone calls and that ... mail be withheld.” Compl. at 1. At no point does the complaint plausibly allege that the prosecutor requested or even knew of the other alleged conditions, such as the sanitation and shackles and chains or the restrictions on religious exercise. Jones thus predicates his appeal on his segregation from the general population and his loss of visitation, telephone, and mail privileges. Aside from a conclusory allegation that he was “being ... punished,” Compl. at 1, the attachments to Jones’ complaint indicate that the prosecutor’s requests for the restrictions were motivated by an intent to protect the safety of certain individuals in and outside of the D.C. Jail and to prevent the continued operation of a narcotics trafficking operation from within the D.C. Jail. See supra note 1. Jones’ complaint alleges no facts that would give rise to an inference that this stated purpose was pretextual or that the prosecutor had any other illegitimate purpose for seeking to have him held in a more restrictive environment. Rather, Jones contends on appeal that as a pretrial detainee he had a substantive due process right under Bell v. Wolfish to be free from restrictive conditions of confinement that were not linked to an institutional purpose and a right under Sell to be free from such deprivations by a prosecutor without a prior court order and a heightened showing of necessity.
In
Bell v. Wolfish,
the Supreme Court held that the Due Process Clause protects pretrial detainees “from certain conditions and restrictions.”
Jones’ reliance on
Bell v. Wolfish
to demonstrate a “clearly established constitutional right,”
Pearson,
In the absence of factual allegations giving rise to a plausible inference of pretext, the allegations against the prosecutor in Jones’ complaint and the attachments supplying the inference that the prosecutor acted to prevent crime and physical harm, must be subject to a Rule 12(b)(6) dismissal to the extent Jones relies on Bell v. Wolfish. The right that Jones suggests— a right while in pretrial detention to be free from restrictions that exceed those imposed on the general population, unless the restriction has an institutional as distinct from a prosecutorial purpose or is required by a court order — was not at the time of the prosecutor’s actions “clearly established.”
Likewise, Jones’ contention that
Sell,
Because Jones fails to show that either a right under
Bell v. Wolfish
to be free from restrictive pretrial confinement except for a strictly institutional, as opposed to a non-punitive governmental purpose, or a right under
Sell
to be free from restrictive pretrial confinement sought by a prosecutor absent a pre-deprivation showing to the district court, was “clearly established,”
Pearson,
The Supreme Court has instructed that not everything a prosecutor does as part of her duties is protected by absolute immunity for activities “intimately associated with the judicial phrase of the criminal process,”
Imbler v. Pachtman,
B.
To state a claim under section 1983, Jones had to allege facts sufficient to show that the acting warden, acting under color of District of Columbia law, subjected Jones to the deprivation of a constitutional right.
See City of Oklahoma City v. Tuttle,
Jones failed to allege in his complaint any punitive change to his conditions of confinement by the acting warden or that a District of Columbia government policy or custom caused the alleged violation of his constitutional rights.
See Monell,
Jones contends that certain allegations, including those regarding the squalid and unsanitary conditions and the routine extreme physical restraint necessarily allege a custom or policy. But to survive a motion to dismiss pursuant to Rule 12(b)(6) Jones had to allege “that a District custom or policy caused the claimed violations of his constitutional rights.”
Warren,
Although [causation] is an objective standard, it involves more than mere negligence. It does not require the District [government] to take reasonable care to discover and prevent constitutional violations. It does mean that, faced with actual or constructive knowledge that its agents will probably violate constitutional rights, the [District gov *602 ernment] may not adopt a policy of inaction.
Warren,
In
Warren,
the court reversed the dismissal of a complaint because the plaintiff had alleged that “that the District [government] ‘knew or should have known’ about the ongoing constitutional violations, but did nothing.”
Id.
Although Jones’ complaint may be read to allege ongoing conditions that were enforced against him and all residents of the S-l Unit, it does not allege any actual or constructive knowledge by a policymaker. The complaint contains not even a conclusory allegation that anyone other than the corrections officers working in the S-l Unit were aware of the conditions in the S-l Unit. The complaint is thus as susceptible to the conclusion that D.C. Jail staff acted without direction in failing to address the conditions in the S-l Unit as it is to an interpretation that a policymaker was aware of the conditions and chose not to act. “Where a complaint pleads facts that are merely consistent with a defendant’s liability, it stops short of the line between possibility and plausibility of entitlement to relief.”
Iqbal,
Because Jones’ complaint alleges no theory of causation whereby the District government or one of its policymakers caused Jones’ alleged constitutional violations, the claims against the acting warden to the extent they were alleged in his official capacity were properly dismissed pursuant to Rule 12(b)(6) for failure to state a claim. Additionally, to the extent Jones has sued the acting warden in his personal capacity, the complaint does not allege any conduct by the acting warden other than his March 1, 2006 memorandum responding to Jones’ housing grievance. Although the complaint names others to whom Jones complained about his housing conditions and privilege restrictions, the acting warden is not among them. The acting warden also is not mentioned in connection with the squalid conditions of confinement in the S-l Unit. Nor did Jones allege any policy or practice whereby the acting warden was the person who made the decisions regarding the conditions of his confinement. Because the acting warden cannot be held liable pursuant to section 1983 for the conduct of others on a theory of
respondeat superior, see Monell,
C.
Finally, Jones’ contention that the district court erred in dismissing his other claims against the detective as conceded is unpersuasive.
On August 27, 2007, the detective who prepared the affidavit in support of the search warrant of Jones’ cell at the D.C. Jail on November 23, 2005, filed a motion to dismiss. The District government served the motion on Jones by first-class mail addressed to Jones at the D.C. Jail. On August 30, 2007, the district court issued an order informing Jones of his obligation to file an opposition or other response to the motion to dismiss and warning Jones that if he failed to file an opposition within 30 days the district court may assume the motion is conceded. Jones never filed an opposition, and on January 4, 2008, the district court granted the motion to dismiss as conceded. See *603 Order, Jones v. Lieber, No. 07-1027 (D.D.C. Jan. 4, 2008), ECF No. 28.
Jones contends for the first time on appeal that he never received the motion to dismiss or the August 30, 2007 order. Issues and legal theories presented for the first time on appeal ordinarily will not be heard on appeal.
See Hormel v. Helvering,
Jones’ other contention that the dismissal was infirm because the Order failed to specify that the dismissal was without prejudice, is without merit. Rule 41(b) of the Federal Rules of Civil Procedure provides that when a plaintiff fails to prosecute a claim or fails to comply with a court order that a subsequent dismissal for that reason “operates as an adjudication on the merits.” The Supreme Court has interpreted this phrase as synonymous with dismissal “with prejudice.”
Semtek Int’l Inc. v. Lockheed Martin Corp.,
Jones notes that Local Rule 83.23 of the District Court for the District of Columbia requires that an order dismissing a claim for failure to prosecute specify that the dismissal is without prejudice. The district court’s order, however, is not for failure to prosecute but for failure to comply with the district court’s scheduling order. As a consequence, the local rule is inapplicable. 7
*604 Accordingly, we affirm the orders dismissing the claims against the prosecutor and the acting warden for failure to state a claim upon which relief can be granted and the claims against the detective as conceded.
Notes
. The attachments to Jones' complaint also included: the detective's affidavit stating that Jones was potentially attempting to run a narcotics trafficking operation from the D.C. Jail; the prosecutor’s December 5, 2005 letter to Jones’ defense counsel explaining that the U.S. Attorney's Office had learned that Jones "was attempting to identify witnesses against him and ‘take care of them' ”; and the U.S. Attorney’s Office’s response to a pretrial mo *593 tion indicating that Jones was enlisting help "to try and locate[] a co-conspirator,” and had listed both the names of "individuals Jones considered as potential witnesses” and "suspected cooperators.”
. Although section 1983 provides a right to action against a person acting under color of state law who subjects any citizen or causes any citizen to be subjected to deprivation of any right secured by the Constitution, 42 U.S.C. § 1983, it does not apply to officials acting under color of federal law, such as a federal prosecutor acting within the scope of her duties. An equivalent right has been recognized by the Supreme Court, however, for money damages against persons acting under color of federal law.
Bivens v. Six Unknown Named Agents of Federal Bureau of Narcotics,
. Jones filed a pro se brief on appeal and also adopted the arguments presented by amicus. See Appellant's Br. 1. In this opinion we do not distinguish between their arguments.
. Jones’ reliance on
Conley v. Gibson,
. The Court noted that "[rjetribution and deterrence are not legitimate nonpunitive governmental objectives.”
Id.
at 539 n. 20,
Conversely, loading a detainee with chains and shackles and throwing him in a dungeon may ensure his presence at trial and preserve the security of the institution. But it would be difficult to conceive of a situation where conditions so harsh, employed to achieve objectives that could be accomplished in so many alternative and less harsh methods, would not support a conclusion that the purpose for which they were imposed was to punish.
Id.
. To the extent that the prosecutor’s "requests” to D.C. Jail officials were made for the purpose of protecting witnesses at Jones' trial, the protection of trial witnesses may be a function "intimately associated with the judicial phase of the criminal process,”
see Kalina,
. To the extent Jones notes that most jurisdictions allow amendment of a complaint to
*604
overcome deficiencies, in this circuit "a request for leave [to amend] must be submitted in the form of a written motion” and the motion must "state with particularity the grounds for seeking the order [and] state the relief sought.”
Benoit v. U.S. Dep’t of Agric.,
