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How Does Witness Tampering Impact a Criminal Case?

McCready Law Group April 9, 2025

California criminal law defines witness tampering as any effort to alter a witness’s testimony or prevent them from providing evidence. This can include threats, bribery, or misleading a witness to change their statement. Witness tampering can have serious consequences in criminal law. Any attempt to influence, intimidate, or coerce a witness can affect the outcome of a trial and lead to additional criminal charges.

These actions can result in felony charges, making the stakes even higher for those accused of a crime. I take these actions seriously at McCready Law Group in Long Beach, California—and I will gladly fight for you every step of the way.

Common Forms of Witness Tampering

Witness tampering can take many forms, some more obvious than others. In California, the law identifies several ways this can occur, including:

  • Threats or intimidation – Pressuring a witness through verbal or physical threats.

  • Bribery – Offering money or benefits to influence testimony.

  • Misrepresentation – Providing false information to mislead a witness.

  • Harassment – Repeatedly contacting or following a witness to pressure them.

  • Obstruction – Preventing a witness from attending legal proceedings.

Even indirect actions, such as asking someone else to influence a witness, can lead to criminal charges. Prosecutors don’t need direct evidence of intimidation—circumstantial evidence can be enough to support a conviction. 

Witness tampering can also involve more subtle forms of coercion, such as implying there will be negative consequences for testifying truthfully. To learn more about your rights, contact a knowledgeable attorney.

Legal Consequences of Witness Tampering

The consequences of witness tampering are severe. California Penal Code Section 136.1 categorizes it as a felony when done with intent to prevent or alter testimony. 

Penalties may include significant fines and years in prison, depending on the circumstances. Repeat offenses or cases involving violence can lead to even harsher sentences.

For those already facing criminal charges, an additional charge of witness tampering can weaken their defense. Judges may view attempts to influence witnesses as an admission of guilt, making it harder to argue for leniency or dismissal of charges.

A defendant’s credibility may suffer, and prosecutors may use the allegations to paint a negative picture of their character.

In addition to criminal penalties, those convicted of witness tampering may face civil lawsuits. A witness who has been threatened or harassed may seek damages for emotional distress or lost wages if their ability to work was affected. This can add further legal and financial burdens for the accused.

State and Federal Laws on Witness Tampering

Witness tampering is illegal under both California and federal criminal law. In California, Penal Code Section 136.1 makes it a crime to intimidate, bribe, or otherwise interfere with a witness or victim. A conviction can lead to felony charges with severe penalties, including state prison time.

At the federal level, 18 U.S.C. § 1512 criminalizes witness tampering in cases involving federal investigations or court proceedings. Federal charges can carry harsher penalties, including up to 20 years in prison for attempting to influence or intimidate a witness. 

Federal prosecutors often pursue these cases aggressively, particularly when tampering affects major criminal trials.

The distinction between state and federal prosecution often depends on the nature of the case. If the underlying offense involves federal crimes, such as drug trafficking or financial fraud, witness tampering charges may fall under federal jurisdiction. 

State-level tampering charges typically apply to cases handled in state courts, such as assault or theft cases.

The Impact of Prosecutors on Addressing Witness Tampering

Prosecutors actively investigate and prosecute witness tampering cases. They rely on phone records, surveillance footage, and testimony from affected witnesses. In some cases, they use plea deals to encourage individuals to testify against those accused of tampering.

Courts often impose protective orders to prevent further contact between the accused and witnesses. Violating these orders can lead to additional penalties, including immediate arrest and harsher sentencing.

Law enforcement agencies may also conduct undercover operations to identify witness tampering efforts. Recorded conversations, monitored communications, and testimony from informants can provide the evidence needed to bring additional charges. 

Additionally, witness statements can be taken early in the legal process to preserve their testimony before any interference occurs.

Defending Against Witness Tampering Allegations

If someone is accused of witness tampering, they need a strong defense strategy. Some possible defenses include:

  • Lack of intent – Demonstrating that there was no intent to interfere with testimony.

  • False accusations – Arguing that the claim was fabricated or exaggerated.

  • Misinterpretation – Showing that statements or actions were misunderstood.

  • Insufficient evidence – Challenging the prosecution’s evidence as weak or circumstantial.

Defendants should avoid any communication with witnesses to prevent further allegations. Even seemingly harmless interactions can be misinterpreted and used as evidence against them. A single conversation could be taken out of context and presented as an attempt to interfere with the legal process.

A skilled criminal defense attorney may also challenge the credibility of the witnesses making the allegations. If the accusing witness has a history of dishonesty or personal bias, this can weaken the prosecution’s case. 

Additionally, recorded conversations and electronic communications may provide context that contradicts the accusations. Defense attorneys may also seek testimony to clarify that the accused’s actions didn’t meet the legal definition of tampering.

How Witness Tampering Affects the Defense’s Strategy

A criminal defense strategy must account for any witness tampering allegations. Defense attorneys may need to shift focus to damage control if accusations arise. This may involve filing motions to dismiss improper evidence, challenging witness credibility, or seeking reduced charges.

Judges and juries often react negatively to allegations of witness tampering. Defense criminal law attorneys must work to separate these claims from the original charges, arguing that they don’t reflect guilt in the underlying case. This is particularly important in cases where witness testimony is critical to the prosecution’s argument.

In some cases, criminal law attorneys may seek to suppress evidence related to witness tampering if it was obtained unlawfully. If law enforcement violated constitutional rights while gathering evidence, a motion to exclude that evidence could improve the defendant’s position in court. 

For example, if a witness was coerced into making an allegation of tampering, the defense may be able to challenge the validity of the claim.

The Impact on Witnesses and the Justice System

Witness tampering does more than affect an individual case—it threatens the integrity of the justice system. Witnesses who feel intimidated may refuse to testify, leaving key evidence out of a trial. This can lead to wrongful convictions or dismissed cases, undermining public trust in the courts.

California courts recognize the importance of protecting witnesses. Prosecutors may offer relocation assistance, confidentiality protections, and security measures for those who feel threatened. 

These steps aim to encourage witnesses to testify without fear. In high-risk cases, law enforcement may assign officers to monitor and protect witnesses until the trial concludes.

Witness tampering can also discourage future cooperation with law enforcement. If individuals believe they’ll face threats or retaliation for testifying, they may be less likely to report crimes or assist in investigations. 

This weakens the justice system’s ability to hold offenders accountable. Law enforcement agencies work to combat this by providing anonymous reporting options and securing witnesses before their testimony becomes public knowledge.

Preventing Witness Tampering in Criminal Cases

Avoiding any actions that could be perceived as witness tampering is critical in a criminal case. Defendants should:

  • Refrain from contacting witnesses, even through third parties.

  • Avoid discussing the case outside of legal counsel.

  • Follow all court orders, including no-contact provisions.

  • Let their attorney handle all communications regarding testimony.

Even well-meaning discussions can be misinterpreted, leading to serious legal consequences. Defendants should trust their attorneys to manage all interactions with witnesses.

Contact Our Office Today to Get Started

For those facing criminal charges, avoiding any appearance of witness tampering is crucial. Working with a knowledgeable criminal law attorney can help protect one’s rights and build a strong defense. 

I serve clients in Long Beach, Huntington Beach, Irvine, Lakewood, Orange County, and the surrounding areas, including Santa Ana and Fountain Valley. Call me at McCready Law Group today for more information.

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