Skip to content
Vindex Defense Investigations

Oklahoma City · Licensed Investigative Agency

Every fact, traced.

Defense investigation and mitigation for Oklahoma criminal defense attorneys. We work for the defense — only.

Request a ConsultOur Services

Services

Services

  • Defense Investigation

    Trial, appellate and post-conviction investigation: locating and interviewing witnesses, background on State witnesses, scene documentation and photography, and case timelines — reported to counsel in clear, sourced memos.

  • Mitigation Investigation

    A full social history across ten domains — family, trauma, mental health, substance use, cognitive, education, medical, community, strengths, and corroboration — delivered as a sentencing-ready report.

  • Records Collection

    Medical, mental health, school and special education, employment, military, DHS and Social Security records — requested, tracked and followed up until they arrive.

  • Online Evidence

    Capture and preservation of publicly available social media and web content, with hash verification and a documented chain of custody.

  • Digital Evidence Review

    Coming in 2027.

Approach

Approach

  1. 01

    Consult

    A free 30-minute call to understand the case, the deadline and what you need answered.

  2. 02

    Plan

    A written scope and budget before work begins. Court-appointed matters follow the approved budget.

  3. 03

    Investigate

    Every interview, record and capture is logged to its source and kept under counsel's direction as work product.

  4. 04

    Deliver

    Clear reports on your timeline, with every fact cited — ready for a motion, a negotiation or a sentencing hearing.

Why Vindex

Why Vindex

Defense only.
Former OIDS appellate investigator. Retained by counsel, reporting only to counsel.
Sourced work.
Every statement in our reports traces to an interview, record or capture in the file.
Mitigation depth.
Direct experience working with adults with developmental disabilities — relevant to intellectual disability, adaptive functioning and family-system issues at sentencing.
Built on systems.
Structured case files, chain-of-custody logs and in-house tools for accurate, fast turnaround. Client information never goes into consumer AI tools.

Court-appointed work

Vindex accepts court-appointed and publicly funded assignments and bills at the appointing authority's approved rates and procedures.

About

Grayson Griffin, Owner and Licensed Private Investigator at Vindex Defense Investigations

Grayson Griffin

Owner, Licensed Private Investigator

Grayson founded Vindex to give Oklahoma defense attorneys investigation and mitigation work they can rely on in court. He served as an Appellate Investigator with the Oklahoma Indigent Defense System from 2024 to 2026, and is a CLEET-licensed private investigator with a master's degree in Crime and Intelligence Analysis and a background in cybersecurity, and brings direct experience supporting adults with developmental disabilities to his mitigation work.

Vindex is named for the vindex of Roman law — the one who stepped forward on behalf of a person being seized and challenged the claim against them.

Contact

Talk through a case.

Free 30-minute consult for attorneys. Call (405) 455-9545 or email contact@vindexdi.com, or use the form below.

Please do not include confidential case details. We will follow up by phone or secure email.