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In Washington, evidence tampering under RCW 9A.72.150 can arise in a wide range of situations. Common examples include destroying documents before a police investigation, deleting digital communications such as text messages or emails, hiding physical objects connected to a crime, or asking another person to conceal or alter evidence. Even seemingly minor actions—like discarding an item believed to be relevant to an investigation—can lead to criminal charges if done with intent to impair its availability. Because intent is a key element, prosecutors often rely on circumstantial evidence to prove that a person knowingly interfered with the legal process.RCW 9A.72.150, a statute from the Revised Code of Washington, addresses the crime of tampering with physical evidence. According to this law:

  1. Definition of the Crime: A person is considered guilty of tampering with physical evidence if they, believing that an official proceeding is pending or about to be initiated, and without legal right or authority, engage in specific acts. These acts include:
    • Destruction, Mutilation, Concealment: Destroying, mutilating, concealing, removing, or altering physical evidence with the intent to impair its appearance, character, or availability in the pending or prospective official proceeding.
    • Presenting False Evidence: Knowingly presenting or offering false physical evidence.
  2. Definition of Physical Evidence: The term “physical evidence” in this context includes any article, object, document, record, or other item of physical substance.
  3. Legal Consequence: Engaging in such activities is classified as a gross misdemeanor under this statute​​.

You can read the text of RCW 9A.72.150 here: https://app.leg.wa.gov/rcw/default.aspx?cite=9A.72.150

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Additional Resources on Washington Criminal Law

Understanding RCW 9A.72.150 evidence tampering is just one part of navigating Washington’s criminal justice system. The following resources provide additional insight into related legal concepts, procedural rules, and real-world applications:

  • Witness Tampering FAQ (Washington State)
    Learn how witness tampering differs from evidence tampering and how both offenses fall under interference with official proceedings. Washington law treats these actions seriously, particularly when they impact testimony or investigations.
  • Criminal Acts in Suits Season 3 Under Washington Law
    This article explores how fictional legal scenarios—such as document destruction—can mirror real criminal exposure under RCW 9A.72.150, where altering or concealing evidence can lead to charges. 
  • Washington State Rule of Evidence 404 Explained
    Evidence rules play a critical role in court proceedings. Understanding when evidence is admissible—and when it is not—helps clarify why tampering with evidence can significantly impact a case.
  • DUI vs. Physical Control in Washington
    This comparison highlights how different charges arise from similar conduct, reinforcing how intent and context shape criminal liability—just as they do in evidence tampering cases.
  • Appealing a Traffic Infraction in Washington
    Even in less severe matters, preserving evidence and following proper procedures is essential. Mishandling or altering evidence can undermine appeals and lead to additional legal consequences.