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Washington Pen Register Law Explained

Washington law strictly regulates how law enforcement can use surveillance technology. Under RCW 9.73.260, the use of pen registers, trap and trace devices, and cell site simulator devices is limited and requires court approval in most situations. 

You can read the full statute here:
https://app.leg.wa.gov/RCW/default.aspx?cite=9.73.260

The Washington pen register law is designed to balance law enforcement needs with strong privacy protections for individuals.

What Devices Are Covered Under RCW 9.73.260?

Pen Registers

A pen register records outgoing phone numbers dialed from a device. It does not capture the content of communications.

Trap and Trace Devices

A trap and trace device captures incoming numbers or identifying information from calls or communications.

Cell Site Simulator Devices

These devices (often called “Stingrays”) can:

  • Track a phone’s location
  • Force connections from nearby devices
  • Collect metadata and identifying information
  • Intercept communications signals

Because of their intrusive nature, these devices are heavily regulated under Washington law.

Court Order Requirement Under Washington Pen Register Law

General Rule: Court Approval Is Required

Law enforcement cannot install or use these devices without a prior court order, except in limited emergency situations. 

To obtain a court order, officers must:

  • Submit an application under oath
  • Identify the law enforcement agency
  • Certify the investigation is ongoing

Probable Cause Standard

The court must find:

  • The information is relevant to an investigation
  • There is probable cause to believe evidence of a crime will be obtained

If these requirements are met, the court may issue an order authorizing use of the device.

What Must Be Included in a Court Order?

A valid order must be highly specific. It may include:

  • The target individual or device
  • Phone numbers or account identifiers
  • Geographic area of surveillance
  • Type of data collected (including metadata)
  • Potential collection of data from third parties

This level of detail ensures transparency and limits overbroad surveillance.

Time Limits and Extensions

60-Day Limit

Orders for surveillance devices generally last:

  • Up to 60 days

Extensions Require Additional Proof

Extensions are not automatic. Law enforcement must:

  • Submit a new application
  • Show a higher likelihood of obtaining evidence

Further extensions require extraordinary circumstances, such as immediate danger.

Emergency Use Exception

When Immediate Action Is Needed

Law enforcement may use these devices without prior court approval if:

  • There is an immediate danger of death or serious injury
  • Probable cause exists

However:

  • A court order must be obtained within 48 hours
  • If not obtained, the data cannot be used as evidence

Improper use may result in criminal penalties.

Privacy Protections Under RCW 9.73.260

Limits on Data Collection

Law enforcement must:

  • Limit data collection to the target
  • Avoid collecting unnecessary third-party data

Mandatory Data Deletion

The law requires:

  • Immediate deletion of non-target data
  • Deletion of target data if no longer supported by probable cause

These safeguards protect individuals from overbroad surveillance practices.

Why Washington Pen Register Law Matters

Strong Privacy Rights

Washington provides stronger privacy protections than many other states. This law ensures:

  • Judicial oversight
  • Limited surveillance scope
  • Protection for innocent third parties

Impact on Criminal Cases

If law enforcement violates RCW 9.73.260:

  • Evidence may be suppressed
  • Charges may be weakened
  • Legal challenges may arise

This makes compliance critical for prosecutors and investigators.

Key Takeaways

  • A court order is generally required to use surveillance devices
  • Orders must be specific and supported by probable cause
  • Emergency use is limited and strictly regulated
  • Data collection and retention are tightly controlled
  • Violations can have serious legal consequences

Call to Action

If you are facing a criminal investigation involving electronic surveillance, or have concerns about your privacy rights, experienced legal counsel is essential.

Contact Blanford Law today at ken@blanfordlaw.com or 253-720-9304 for guidance on your legal matter.

Additional Resources