Why this page exists alongside the national one
Our national witness tampering page covers the statute in full. Read it for the complete picture. This page answers the California questions: which courtroom, which district, which circuit rules, and what that means for a person facing the charge here.
The short version is that the law is federal but the forum is local. Section 1512 reads the same in San Diego and Maine. The judge, the prosecutors, the jury instructions, and the courthouse you walk into are Californian. Those local facts shape how the case is investigated, charged, tried, and sentenced, so they deserve their own page. Start with our California federal courts hub for the full map, then come back here for the charge.
Which courtroom: four districts, one circuit
Congress divided the state by statute. It provides:
"California is divided into four judicial districts to be known as the Northern, Eastern, Central, and Southern Districts of California."
Your case stays in the district where it is filed. A case filed in Los Angeles is a Central District case from start to finish. A case filed in San Diego is a Southern District case. Transfer between districts is rare and needs a specific legal reason, so find the district named in your papers first, then open that district page on this site.
Federal court is the only court. The jurisdictional statute provides:
"The district courts of the United States shall have original jurisdiction, exclusive of the courts of the States, of all offenses against the laws of the United States."
That word exclusive means no California state judge shares the case. The prosecutor is the United States Attorney's Office for the district, the judge is a federal district judge, and sentencing runs under federal law.
Court cities are set by the same statute, so you can tell from your papers where appearances happen. The law provides:
"Court for the Northern District shall be held at Eureka, Oakland, San Francisco, and San Jose."
It provides:
"Court for the Eastern District shall be held at Bakersfield, Fresno, Redding, and Sacramento."
For the Central District, the Western Division sits in Los Angeles:
"Court for the Western Division shall be held at Los Angeles."
The Southern Division, which is Orange County, provides:
"Court for the Southern Division shall be held at Santa Ana."
The Eastern Division covers Riverside and San Bernardino counties. For the Southern District, the rule is short:
"Court for the Southern District shall be held at San Diego."
If your papers say San Diego, open the Southern District page. If they say Los Angeles, open the Central District page. San Francisco, Oakland, and San Jose point to the Northern District, and Sacramento and Fresno point to the Eastern District. Each district page lists its courthouses and local practice.
Venue has a special rule for this charge. The statute provides:
"A prosecution under this section or section 1503 may be brought in the district in which the official proceeding (whether or not pending or about to be instituted) was intended to be affected or in the district in which the conduct constituting the alleged offense occurred."
In plain terms, a threatening call placed from Los Angeles meant to affect a grand jury sitting in Sacramento can be filed in either district. When messages, travel, or payments cross district lines, which office charges the case is a live question from day one.
Appeals leave the district but stay in the circuit. Under federal law:
"The courts of appeals (other than the United States Court of Appeals for the Federal Circuit) shall have jurisdiction of appeals from all final decisions of the district courts of the United States"
For California that court is the Ninth Circuit, which the statute places California inside. An appeal challenges legal error in what already happened, and it runs on strict deadlines measured from the judgment. Read about that process early rather than after time has run.
A caution that applies to every page on this site. Penalties described here are statutory maximums or guideline ranges, never predictions about any one person. The facts of a case change everything.
The statute in three tiers under § 1512
Section 1512 is one statute with several grades, and the grade decides everything about exposure. Think of it in three tiers: killing and force, persuasion and records, and harassment.
The top tier covers killing and physical force. The statute punishes "Whoever kills or attempts to kill another person" to prevent testimony, block records, or stop someone from reporting a federal offense to law enforcement or a judge. It separately punishes "Whoever uses physical force or the threat of physical force against any person, or attempts to do so" to influence or delay testimony, make someone withhold or destroy records, help someone dodge a subpoena, or stop a report to law enforcement. A killing is punished under the murder statutes:
"in the case of a killing, the punishment provided in sections 1111 and 1112;"
Force without killing carries up to 30 years:
"imprisonment for not more than 30 years; and"
A threat of force carries up to 20 years:
"in the case of the threat of use of physical force against any person, imprisonment for not more than 20 years."
The middle tier is where most California cases live. It punishes "Whoever knowingly uses intimidation, threatens, or corruptly persuades another person, or attempts to do so, or engages in misleading conduct toward another person" who acts with intent to do one of three things. First:
"influence, delay, or prevent the testimony of any person in an official proceeding;"
Second, make someone withhold or damage evidence:
"withhold testimony, or withhold a record, document, or other object, from an official proceeding;"
or:
"alter, destroy, mutilate, or conceal an object with intent to impair the object's integrity or availability for use in an official proceeding;"
Third, cut off reporting to the authorities:
"hinder, delay, or prevent the communication to a law enforcement officer or judge of the United States of information relating to the commission or possible commission of a Federal offense"
Each of these carries the same ceiling:
"shall be fined under this title or imprisoned not more than 20 years, or both."
Note what the middle tier does not require. An official proceeding need not already exist:
"an official proceeding need not be pending or about to be instituted at the time of the offense;"
A phone call urging a coworker not to talk to agents, made before any grand jury exists, can still fall inside this tier if the other elements are met.
The records tier sits beside the persuasion tier. It punishes "Whoever corruptly" acts through one of two paths. First, the records path:
"alters, destroys, mutilates, or conceals a record, document, or other object, or attempts to do so, with the intent to impair the object's integrity or availability for use in an official proceeding; or"
Second, the catch-all path:
"otherwise obstructs, influences, or impedes any official proceeding, or attempts to do so,"
with the same 20-year ceiling:
"shall be fined under this title or imprisoned not more than 20 years, or both."
As explained below, the Ninth Circuit's model instructions read that catch-all narrowly after the Supreme Court's Fischer decision, so which path the charge takes matters enormously.
The bottom tier covers harassment. It punishes "Whoever intentionally harasses another person and thereby hinders, delays, prevents, or dissuades any person from" attending or testifying, reporting an offense, making an arrest, or bringing a prosecution, "or attempts to do so, shall be fined under this title or imprisoned not more than 3 years, or both." Harassment needs no threat and no force, but it caps at 3 years, far below the tiers above.
Two more provisions apply across all tiers. The testimony or records at issue need not have been admissible:
"the testimony, or the record, document, or other object need not be admissible in evidence or free of a claim of privilege."
And conspiracy carries the same punishment as the completed offense:
"Whoever conspires to commit any offense under this section shall be subject to the same penalties as those prescribed for the offense the commission of which was the object of the conspiracy."
An agreement to tamper, plus the required proof, sentences like tampering itself.
What the jury hears in a California courtroom
Jury instructions decide trials, and in California they come from the Ninth Circuit. The circuit's manual states that its models are "intended principally to set forth the elements of the offense in plain language consistent with the applicable statute" and that judges adapt them to the facts of each case. What follows is how that plays out for this statute, and it applies in California courtrooms because California sits in the Ninth Circuit. It is the Ninth Circuit's approach, not a nationwide rule.
Start with what the manual does not contain. Its obstruction chapter lists models for influencing a juror, injuring a juror, the omnibus clause, records destruction, the official proceeding charge, and agency proceedings. It gives no standalone elements model for a persuasion based charge under subsection (b), the tier most cases are charged under. So for a (b) case, a California judge builds the charge from the statute text plus the definition of the key word, corruptly.
That definition lives in model instruction 4.12. For prosecutions under subsection (b), the Ninth Circuit's manual states that the term corruptly "must reflect some consciousness of wrongdoing." In plain terms, the government must show the accused knew the persuasion was wrongful, not merely that words were spoken. The same comment records two points that favor the accused and one warning. First, the Ninth Circuit has held that a person does not act corruptly when she "non-coercively persuades a witness to exercise a legal privilege not to testify." Telling a witness, without pressure, that they may use a lawyer or assert a real privilege is different from leaning on them to stay silent. Second, the Ninth Circuit has noted disagreement among the circuits over whether merely urging a witness not to cooperate, without active lying, falls inside subsection (b) at all. Third, the manual notes the circuit had not resolved whether corrupt persuasion covers urging others to invoke the right to remain silent. Each of these is a live issue to press, not settled law to assume.
For a records or catch-all charge under subsection (c), the jury hears model instruction 19.5. The current version, revised after Fischer, describes the Supreme Court's decision this way: the catch-all reaches conduct impairing records, documents, objects, testimony, and intangible information used in an official proceeding, but it "does not extend to other obstructive conduct." Conduct with no tie to records, documents, objects, testimony, or information used in a proceeding is outside the catch-all as the Ninth Circuit's manual now describes it. The same instruction requires a nexus, namely:
"(1) the obstructive conduct be connected to a specific official proceeding that was (2) either pending or was reasonably foreseeable to the defendant when he engaged in the conduct."
That two-part test is where many California (c) cases are won or lost. The government must connect the conduct to a specific proceeding, and must show that proceeding was pending or reasonably foreseeable to the accused at the time. Vague awareness that the authorities might look into something someday is not the same as a specific foreseeable proceeding.
For the closest neighbour charge, section 1503, the jury hears model instruction 19.3. It has two elements:
"First, the defendant influenced, obstructed, or impeded, or tried to influence, obstruct, or impede the due administration of justice; and"
"Second, the defendant acted corruptly, or by threats or force, or by any threatening communication, with the intent to obstruct justice."
Compare that with subsection (b) above. The 1503 model speaks of the due administration of justice and names jurors and court officers as the people protected. The 1512 model language speaks of witnesses, victims, and informants, testimony in an official proceeding, and reports to law enforcement. When one phone call produces both charges, these different protected targets are what counsel tests first.
Penalties on paper for a § 1512 charge
Each count is punished separately, so the grade of each count sets the ceiling. Killing a witness is punished under the murder statutes referenced above. Force or attempted force against any person carries "imprisonment for not more than 30 years; and" a threat of force carries "in the case of the threat of use of physical force against any person, imprisonment for not more than 20 years." Intimidation, threats, corrupt persuasion, misleading conduct, and records charges each carry "shall be fined under this title or imprisoned not more than 20 years, or both." Harassment carries "or attempts to do so, shall be fined under this title or imprisoned not more than 3 years, or both."
Fines follow the general fine statute. An individual convicted of a felony faces "for a felony, not more than $250,000;" and an organization faces "for a felony, not more than $500,000;" with an alternative allowing a fine of "the greater of twice the gross gain or twice the gross loss" where the offense produced gain or loss. A prison term can be followed by supervised release. None of the persuasion, records, or harassment counts carries a mandatory minimum. The floor in those cases is set by the guidelines and the judge, not by Congress.
One provision can raise the ceiling past 20 years even for a persuasion count:
"If the offense under this section occurs in connection with a trial of a criminal case, the maximum term of imprisonment which may be imposed for the offense shall be the higher of that otherwise provided by law or the maximum term that could have been imposed for any offense charged in such case."
If tampering connects to a trial where a charged offense itself carried a higher maximum, the tampering maximum rises to match it.
Repeat the caution because it matters. These are statutory maximums stated in the abstract. They are not predictions. Two people convicted under the same subsection in the same courthouse routinely receive very different sentences because their conduct, roles, and histories differ.
How the sentence is actually calculated
The Guidelines Manual index sends each non killing subsection of section 1512 to guideline 2J1.2, the general rule for obstruction. Subsection (a) is different: killing and assault conduct maps to the homicide and assault guidelines alongside 2J1.2, so counsel must identify the exact subsection and conduct before doing any math. A single guideline does not cover every form of this offense.
For the persuasion, records, and harassment counts, the math starts here:
"(a) Base Offense Level: 14"
From there the level rises with specific offense characteristics. If the offense involved causing or threatening physical injury or property damage to obstruct justice:
"If the offense involved causing or threatening to cause physical injury to a person, or property damage, in order to obstruct the administration of justice, increase by 8 levels."
If the offense produced "substantial interference with the administration of justice," the rule adds 3 levels:
"increase by 3 levels."
The commentary explains that phrase with examples, including "an indictment, verdict, or any judicial determination based upon perjury, false testimony, or other false evidence" and "the unnecessary expenditure of substantial governmental or court resources." A tampered proceeding that forced agents to redo months of work, or a verdict built on testimony the accused corrupted, is where this increase bites.
Records conduct has its own increase. When the offense "involved the destruction, alteration, or fabrication of a substantial number of records, documents, or tangible objects" or picked out an especially probative record to destroy, or was otherwise extensive in planning, the rule adds:
"increase by 2 levels."
Then comes the cross reference, which can move a case into a much higher range. When the tampering obstructed the investigation or prosecution of another crime, the guideline directs the court to:
"apply §2X3.1 (Accessory After the Fact) in respect to that criminal offense, if the resulting offense level is greater than that determined above."
In plain terms, tampering that shielded a serious underlying crime can sentence as if the accused helped that crime after the fact, whenever that math is higher. Our federal sentencing page walks through how that hearing works.
The range the math produces is a starting point, not a prediction. The manual itself states that the guidelines "represent the first step in the sentencing process" and are "one of multiple factors judges must consider." Criminal history, role, acceptance of responsibility, and the specific facts move the final number in every California courtroom.
The closest neighbours: section 1503 and section 1519
Tampering charges rarely arrive alone. California prosecutors often add a neighbouring obstruction count from the same events, and knowing where each statute ends is where defenses live.
Section 1503 is the closest neighbour. It punishes anyone who "corruptly, or by threats or force, or by any threatening letter or communication, endeavors to influence, intimidate, or impede any grand or petit juror, or officer in or of any court of the United States" and anyone who "endeavors to influence, obstruct, or impede, the due administration of justice." Both statutes map to guideline 2J1.2, so the guideline math looks alike. The elements do not. Section 1512 protects witnesses, victims, and informants and reaches persuasion before any proceeding exists, since "an official proceeding need not be pending or about to be instituted at the time of the offense." Section 1503 protects jurors and officers and the proceeding itself, and in a California courtroom it is tried under the Ninth Circuit's two element model quoted above. An outsider who leans on a witness to stay home commits tampering. Someone who leans on a grand juror over a vote commits 1503. When both are charged together, as often happens, each count needs its own proof.
Section 1519 is the second neighbour, aimed at records. Under the Ninth Circuit's model instruction 19.4, the government must prove:
"First, the defendant knowingly altered, destroyed, concealed, or falsified a record, document, or tangible object; and"
"Second, the defendant acted with the intent to impede, obstruct, or influence an actual or contemplated investigation of a matter within the jurisdiction of any department or agency of the United States."
Note the difference from subsection (c). Section 1519 needs only an actual or contemplated investigation of a federal matter, while subsection (c) needs the nexus to a specific pending or reasonably foreseeable official proceeding quoted above. Deleted files meant to frustrate an agency investigation are usually a 1519 case, while deleted files meant to keep material from a specific grand jury or trial are usually a 1512(c) case. The charging choice changes the elements, the instruction, and the trial story, so counsel presses it early. Where proceeds moved through accounts to hide them, further charges can follow, and each added count needs its own proof.
Defenses and issues that actually arise
Every case turns on its facts, but tampering defenses cluster in a few places. First, the truthful testimony defense. The statute provides:
"it is an affirmative defense, as to which the defendant has the burden of proof by a preponderance of the evidence, that the conduct consisted solely of lawful conduct and that the defendant's sole intention was to encourage, induce, or cause the other person to testify truthfully."
This is a real defense with a real burden. The accused must prove, more likely than not, that everything done was lawful and that the only goal was truthful testimony. A recorded message urging a witness to tell the truth, with no threat and no inducement attached, is the classic form. Mixed motives destroy it, since the word sole does the work.
Second, the Doss line. As noted above, the Ninth Circuit's manual records that non-coercive persuasion to use a legal privilege is not corrupt. Advice to get a lawyer, or a calm explanation of the right to remain silent, without threats or pressure, sits on the lawful side of that line. Threats, payments for silence, and lies to steer testimony sit on the other side. Which side a conversation falls on is decided by recordings, messages, and the witnesses to it, so preserving the full context of every contact helps counsel place it.
Third, the Fischer limit on the catch-all. Conduct charged under subsection (c)(2) must impair records, documents, objects, testimony, or information used in an official proceeding, because the provision "does not extend to other obstructive conduct." Purely disruptive behavior with no tie to those materials falls outside the catch-all as the Ninth Circuit's manual now describes it. Counsel tests whether the charged acts touched proceeding materials at all.
Fourth, nexus and foreseeability. For a (c) charge, the government must tie the conduct to a specific proceeding that was pending or reasonably foreseeable to the accused, in the words quoted above. Routine file handling before anyone knew of an investigation, or acts aimed at a state matter with no federal proceeding in view, get tested here. For a (b) charge built on stopping a report to law enforcement, the parallel question is what the accused knew about the federal character of the matter, since the statute separately provides that no state of mind need be proved about whether the officer or proceeding was federal.
Fifth, the harassment boundary. Harassment under subsection (d) punishes intentional pressuring without threats or force, capped at 3 years. Conduct charged as persuasion or threats under subsection (b) carries up to 20. Where the conduct was annoying and persistent but never threatening, counsel presses to keep the case in the lower tier.
Sixth, venue and multiplicity. Because a case can be filed where the conduct occurred or where the proceeding was meant to be affected, multi-district conduct can draw competing filings, and one course of conduct can produce stacked counts under several subsections plus conspiracy. Each count and each venue needs its own legal basis, and each is open to challenge.
A word on what is not a defense. That no case was pending is not a defense, since the statute says so directly. That the testimony would have been inadmissible is not a defense, since admissibility is expressly excused. That others told the witness the same thing is not a defense. And that the witness testified truthfully anyway is generally not a defense to guilt, though it can matter at sentencing.
If you are under investigation in California
Act early and say little. Do not meet agents without counsel, and remember that FBI agents who contact you in California typically build cases for the United States Attorney's Office of the district where charges would be filed, so anything you say travels straight to the future prosecution team. Learn how those early contacts work on our FBI investigations page. Do not contact any witness, victim, or informant to explain, apologize, or ask them to stay silent. That contact is exactly what this statute punishes, and it can turn an investigation of something else into a tampering charge of its own.
If a grand jury subpoena arrives, read it with counsel before touching the records it describes. Deleting, altering, or hiding responsive material after learning of the subpoena is the records path of this statute in its simplest form. Preserve everything, log who handled what, and let counsel manage production. If an arrest follows, custody and release are decided fast, so learn how a federal detention hearing works and have counsel ready. And if charges are filed, the indictment names the district and the courthouse city, so check both and plan to arrive early, since security lines at the large California courthouses run long on busy mornings. Then get advice before you decide anything. Whether to cooperate, seek a deal, or fight turns on the messages, the proceeding, and what the government can prove about your intent, none of which you can judge alone in the first days.