Private investigation in Beaverton, OR

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Certain forensic details in a person's handwriting can serve as compelling evidence in the courtroom. Forensic handwriting and document services is another tool you can use to help resolve your questions and get realistic proof for your case. For instance: -Is a signature genuine or has it been forged? -Has a document been altered? -Did a certain suspect write an anonymous note? Jacqueline Joseph, a certified forensic document examiner and evidence consultant, has been located in downtown Portland, Oregon since 1992. She is qualified to testify in court and uses court-accepted forensic standards and equipment that may help you gain the proof you seek and answers you need.

We specialize in backgrounds, threat assessment and interviewing witnesses and principals.

We specialize in performing polygraph examinations for persons referred by parole/probation officers and for those represented by attorneys in active criminal cases. We do not, at this time, perform polygraph testing for the general public.

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Koch Security Group | Security & Investigations Backed by Real Experience Koch Security Group provides professional security and investigative services across Oregon and Washington, led by a team with proven experience in law enforcement, military, and private sector intelligence work. We go beyond basic coverage — offering reliable, responsive, and discreet protection tailored to your needs. Our clients include businesses, property managers, legal professionals, and individuals who trust us to manage sensitive, high-risk, or complex situations with professionalism and care. Services Include: ✔ Armed & Unarmed Security (retail, warehouse, apartments, parking lots, construction sites) ✔ Mobile Patrol & Property Monitoring ✔ Executive Protection & High-Risk Threat Response ✔ Private Investigations (civil, criminal, insurance, domestic, employee-related) ✔ Surveillance, Background Checks, Skip Tracing, Witness Locates Why Choose Koch Security Group? • Staffed by Law Enforcement & Military-Trained Professionals • Licensed & Insured in Oregon & Washington • Discreet, Responsive & Professional • Tailored Solutions & On-Call Availability When safety and truth matter, trust a company with real-world experience. Contact Koch Security Group today for a free consultation.