About Private Investigator Detective Criminal Investigations | PSI Investigations Seattle

P.S.I. Investigations llc
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Neil Harrison's Biography

PITagBioPic04232020.jpegFormer Canadian Forces member, over 25 years private and investigative experience in the following areas:

Criminal Defense - Fraud - Missing Persons - Officer Involved Shootings - Witness Interviews - Wrongful Death - Equivocal Investigations - Statement Analysis - RICO Violations - Sexual Assault - Child Custody - DNA Testing - Expert Latent Fingerprint Services - Surveillance - and more.

Member: ACFE, WALI, PNAI, NCISS, and others


Our investigations, testimony, and evidence presented at trial, have assisted in obtaining Civil Search Warrants, Injunctions, filing RICO suits, overturned court orders, obtaining criminal convictions (from insurance fraud to conspiracy to commit murder), military court martial convictions, dismissed criminal charges, employee theft and fraud charges, witness impeachments, and much more.

1995 - Current - President - PI Lic #3429 P.S.I. Investigations LLC - WA

1995 - Current - President - Bus Lic #1886 P.S.I. Investigations LLC - WA

After a career in the international transportation field where he became familiar with international import/export regulations and customs policies procedures that took him across Canada and the northern United States, Neil joined the Canadian military (reserves) in the late 1980’s where he first became involved in active criminal  investigations and testified at courts martial proceedings, wetting his appetite for his future career in the professional investigative field.

After leaving the military in the early 1990’s he completed the Canadian Investigative Academy training program and started his own successful P.I. business in Vancouver BC where he became proficient in insurance fraud investigations, criminal investigations, and became a director of the provincial P.I. Association.

During his time in Canada, Neil conducted a wide variety of investigations including criminal fraud, child custody, international theft, conspiracy to commit murder, and is one of few civilian investigators to obtain and execute civil search warrants (Anton Pillar Order) on suspect’s businesses and personal residences. Neil also taught private investigation courses at Vancouver Community College for the accredited Focus Training Institute.

Since moving to Washington State, Neil established P.S.I. Investigations LLC where he focuses primarily on criminal defense and legal investigations and has provided expert investigative services through the courts for indigent defense cases. Neil has successfully investigated Murder, Homicide, Equivocal Death, Officer Involved Shooting, Sexual Assault, Rape (adult & child), Felony Assault, Drug Crimes, Racketeering/Influence/Corruption cases, Fraud, and much more. 

Neil is also trained in Forensic Statement Analysis and is a DNA collection technician. He offers basic crime scene investigation, and testing services through an independent private laboratory in the U.S., and has an expert latent print examiner on staff for fingerprint work. Neil is also the current president of the Washington state professional investigators association (WALI), and is a frequent guest speaker at their annual conferences.

With the experience of over 3,000 completed criminal investigations to date, over his 20 plus year career, Neil currently focuses on criminal investigations and conducts training classes for private investigators in the areas of Criminal Defense Investigations, General Investigations, and Interviewing/Interrogation skills.

Neil is also a proud member/supporter of  WALI, WDA, WACDL, NACDL, and other professional associations.



Neil is highly recommended, he investigated the assault with a deadly weapon charges against me, uncovered false testimony by states witnesses, and testified as an expert during trial, resulting in a speedy acquital of all charges by the jury.

Snohomish County


Professional Development

General Investigation and Interviewing Techniques Instructor

Certified Professional Investigator (CPI)

Certified Armed Investigator (CAI)

Founding member of Organisation of Private Investigators of BC (OPIBC)

Current President & board member of Washington Association (WALI)

Member of National National Association Criminal Defense Lawyers (NACDL)

Member of the Washington Defenders Association (WDA)

Member of the Washington Association Criminal Defense Lawyers (WACDL)