The same training the State relies on — read against itself.
Zachary Marshall is a certified Drug Recognition Expert and advanced collision investigator with a career in municipal law enforcement — now retained nationwide to evaluate impaired driving and vehicular crime matters where the technical record decides the case.
During that career, he conducted hundreds of DUI investigations, served as lead investigator on serious-injury and fatal collisions, and worked with FARO 3D scene documentation technology in the field — experience that informs his current causation and evidentiary analysis, rather than a standalone scanning service offered today. The same standards used to build the State's case are now applied — independently — to assess where it does, and does not, hold up.
Certifications and qualifications.
- Drug Recognition Expert (DRE)
IACP / NHTSA — full DRE program (100+ hours).
- Advanced Roadside Impaired Driving Enforcement
ARIDE certified — NHTSA.
- Advanced Collision Investigation
IPTM At-Scene & Advanced Crash Investigation (160 hours).
- FARO 3D Documentation Experience
In-field use during prior law enforcement collision investigations — informs current causation and evidentiary analysis.
- Preliminary Breath Test (PBT) Technician
Washington State Patrol certified.
- FBI Hostage & Crisis Negotiator
Federal Bureau of Investigation — Level I.
Awarded for the work the practice now reviews.
Years of recognition from agencies and organizations on the State's side of the docket — applied today, exclusively, to the defense.
- 2023 & 2024 Officer of the Year — WA Target Zero Program
- 2024 Commendation — Mothers Against Drunk Driving (MADD)
- 2024 Commendation — U.S. Drug Enforcement Administration (DEA)
- 2022 & 2023 DUI Enforcement Award — Chief of Police
- Founding member, dedicated municipal traffic unit
Measured. Technical. Litigation-aligned.
Every engagement begins with a candid triage conversation. Where the record is strong for the State, it is named plainly. Where there is leverage, it is identified, documented, and translated into something usable — a written strategic report, cross-examination outlines, motion support, or trial testimony.
The practice is intentionally small. Engagements are limited each quarter so that every matter receives the attention serious cases require. Adjacent expertise — including FBI-certified crisis negotiation and ongoing law enforcement subject-matter consulting for AI development — informs the work without diluting its focus.