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Alibi Defense to Criminal Charges

Posted by Ronald D. Hedding | Jun 17, 2025

Understanding the power of establishing an alibi in California can be a game-changer in your legal defense. It means you have evidence that you were not at the scene of the crime when it occurred and could not possibly have committed it. This knowledge empowers you in your legal journey.

An alibi defense claims that you were somewhere else when the crime occurred, there was no reasonable opportunity for you to have committed the crime, and there were no other means by which you could have committed the crime. This emphasis on credible evidence should reassure you about the strength of your case.

The prosecutor has the burden of proof to establish your guilt beyond a reasonable doubt. This ensures a fair trial. This ensures a fair trial. Therefore, the purpose of raising the alibi defense is to show there is reasonable doubt that you were present when the crime took place. If the district attorney fails to prove your guilt beyond a reasonable doubt, the jury is required by CALCRIM 3400 to acquit you.

The alibi defense differs from affirmative defenses such as self-defense or duress. With affirmative defenses, you first have to prove by a preponderance of the evidence, meaning that it is more likely than not that the defense is applicable to your case, before the jury can consider it. This ensures the objectivity of the legal process.

Alibi Quick Facts

  • Establishing a credible alibi can not only cast doubt on a prosecutor's case, but it can also result in dismissed charges or a not guilty verdict.
  • For an alibi defense to be effective, it must be supported by strong, verifiable evidence, typically from multiple sources. 
  • The defendant typically introduces evidence, often through witnesses or documentary proof, such as phone records.
  • Other evidence includes receipts, surveillance footage, or even GPS data to support that they were not at the scene of the crime.
  • The defendant does not have to prove the alibi beyond a reasonable doubt. Instead, they must demonstrate that the alibi is plausible enough to raise a reasonable doubt about whether the defendant could have committed the crime.
  • If the alibi is plausible, the jury or judge, who are tasked with evaluating the evidence, may conclude that there is reasonable doubt. 
  • Often, the defense is required to notify the prosecution before the trial if they intend to use an alibi defense, including the details of where the defendant claims to have been and identifying any witnesses who will support the alibi.
  • The notification requirement enables the prosecution to investigate the claim, prepare rebuttal evidence, and avoid surprises during the trial, making you feel more informed and prepared. 
  • Prosecutors often attempt to discredit alibi witnesses by questioning their reliability, potential biases, or inconsistencies in their testimonies.

What Does PC 1054.3 Say?

California Penal Code 1054.3 PC says, "(a) The defendant and their attorney shall disclose to the prosecuting attorney:

(1) The names and addresses of persons, other than the defendant, he or she intends to call as witnesses at trial, together with any relevant written or recorded statements of those persons, or reports of the statements of those persons, including any reports or statements of experts made in connection with the case, and including the results of physical or mental examinations, scientific tests, experiments, or comparisons which the defendant intends to offer in evidence at the trial.

California Penal Code 1054.3 PC

(2) Any real evidence that the defendant intends to offer in evidence at the trial.

(b)(1) Unless otherwise specifically addressed by an existing provision of law, whenever a defendant in a criminal action or a minor in a juvenile proceeding brought pursuant to a petition alleging the juvenile to be within Section 602 of the Welfare and Institutions Code places in issue their mental state at any phase of the criminal action or juvenile proceeding through the proposed testimony of any mental health expert, upon timely request by the prosecution, the court may order that the defendant or juvenile submit to examination by a prosecution-retained mental health expert.

(A) The prosecution shall bear the cost of any such mental health expert's fees for examination and testimony at a criminal trial or juvenile court proceeding.

(B) The prosecuting attorney shall submit a list of tests proposed to be administered by the prosecution expert to the defendant in a criminal action or a minor in a juvenile proceeding. At the request of the defendant in a criminal action or a minor in a juvenile proceeding, a hearing shall be held to consider any objections raised to the proposed tests before any test is administered.

Before ordering the defendant to submit to examination, the trial court must make a threshold determination that the proposed tests bear some reasonable relation to the mental state placed in issue by the defendant in a criminal action or a minor in a juvenile proceeding. For the purposes of this subdivision, the term “tests” shall include any assessment techniques, such as a clinical interview or a mental status examination.

(2) The purpose of this subdivision is to respond to Verdin v. Superior Court 43 Cal.4th 1096, which held that only the Legislature may authorize a court to order the appointment of a prosecution mental health expert when a defendant has placed his or her mental state at issue in a criminal case or juvenile proceeding pursuant to Section 602 of the Welfare and Institutions Code.

Other than authorizing the court to order testing by prosecution-retained mental health experts in response to Verdin v. Superior Court, supra, it is not the intent of the Legislature to disturb, in any way, the remaining body of case law governing the procedural or substantive law that controls the administration of these tests or the admission of the results of these tests into evidence."

Essential Alibi Evidence

  • Eyewitness testimony. These are statements by people who can verify your whereabouts at the time of the alleged crime. The credibility of eyewitnesses plays a significant role in the strength of their testimony. Factors such as the witness's relationship to you, their ability to clearly recall details, and whether other forms of evidence can corroborate their account can either strengthen or weaken their testimony. 
  • Surveillance footage. It provides visual proof of your location at a specific time. One of the advantages of video evidence is its objectivity. A time-stamped video provides clear and impartial documentation. Obtaining such footage quickly is critical, as many surveillance systems automatically overwrite recordings after a set period.
  • Documentary Evidence. Receipts, invoices, tickets, and other time-stamped documents can be strong tools in verifying your whereabouts. Some examples include credit card receipts, bank statements that detail the date and time of transactions, and travel-related documents such as boarding passes, ride-share records, or public transportation tickets, which indicate you were in another location.
  • Electronic Evidence. This form of alibi evidence can offer real-time data to support your claims. Examples of electronic evidence include cell tower records, which show which towers your phone was connected to at specific times, helping to establish your general location. Other examples include GPS data from navigation apps or devices, as well as smart home device logs, such as timestamps from security alarms or door cameras, which can confirm your activities or presence at home.

Why You Need a Defense Lawyer 

The defense lawyer must carefully scrutinize any alibi witnesses or evidence to ensure that it is credible, as presenting a false or weak alibi can have dire consequences. Suppose the district attorney successfully discredits the alibi. In that case, it may damage the defense's credibility in the eyes of the jury, so the information must be accurate.

Additionally, an alibi defense can also complicate plea negotiations. The district attorney might be less willing to offer favorable plea deals if they believe the defense plans to use an alibi, as they might interpret the defense's stance as a sign of confidence in their ability to obtain an acquittal.

When effectively supported by credible evidence and witnesses, an alibi can create reasonable doubt in the prosecution's case, leading to an acquittal. However, it requires careful preparation and an understanding of the facts and legal procedures governing its use.

Formulating an effective alibi defense requires a detailed and well-crafted approach. The evidence must be gathered and presented in a manner that is admissible in court. Working with our experienced California criminal defense lawyers can help ensure that your alibi is supported by the strongest possible evidence and presented in the most effective manner. For more information, contact the Hedding Law Firm, located in Los Angeles.

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About the Author

Ronald D. Hedding
Ronald D. Hedding

What Makes Ronald Hedding Uniquely Qualified To Represent You? I've been practicing criminal defense for almost 30 years and have handled thousands of cases, including all types of state and federal sex crime cases. All consultations are discreet and confidential.

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