Brady Offense No. 1779139701 - 25874341

Matthew M McNabb
25 West Main Street
Auburn, Washington 98001

Date of Offense

May 15, 2026

Official Statement

A commissioned officer of the Auburn Police Department was arrested by the Pierce County Sheriff’s Office Internet Crimes Against Children Unit on suspicion of felony immoral communication with a minor. Public reporting states that the officer was taken into custody at the Auburn Police Department, booked into the Pierce County Jail, and placed on administrative leave pending formal charging review. This arrest presents a direct Brady/Giglio concern because the alleged conduct bears on the officer’s judgment, honesty, moral fitness, abuse of public trust, and reliability as a government witness. The concern is not limited to the underlying criminal allegation; it extends to every case in which the officer authored reports, submitted affidavits, sought warrants, handled digital evidence, interviewed witnesses, participated in child-protection or sex-offense investigations, made credibility determinations, or offered testimony.

The reported facts create mandatory impeachment-disclosure obligations for prosecutors and notice obligations for the Auburn Police Department. A law enforcement officer accused of predatory communication with a person believed to be a minor cannot be treated as an ordinary witness while the allegation remains unresolved. The officer’s pending criminal investigation, administrative leave status, electronic-device review, and any internal-affairs record, charging decision, probable-cause finding, disciplinary finding, resignation, termination, plea, conviction, diversion, or declination are Brady/Giglio material and must be preserved, indexed, reviewed, and disclosed in every affected case. The officer should be treated as a potential impeachment-disclosure officer unless and until the criminal and administrative record is fully resolved through a transparent, verifiable process.

This complaint further raises an institutional disclosure issue for the Auburn Police Department and any prosecuting authority relying on Auburn Police Department witnesses. Public reporting states that the arrest was coordinated at the police station to protect safety and prevent destruction of evidence, and that investigators were reviewing the officer’s electronics. Those facts make evidence integrity, digital-device access, report accuracy, and case-contamination review central to the Brady analysis. Every open and closed case involving this officer should be audited for impeachment exposure, false or incomplete reporting, undisclosed credibility defects, conflicts of interest, misuse of police authority, and any dependency on the officer’s uncorroborated statements.