Where Scholarship Meets Justice

Integrity.
Assessments.
Investigations.

Court-approved private investigations serving criminal defense attorneys across the Southern District of Texas, Harris County, and Fort Bend County. CJA Panel Vendor. Bilingual English/Spanish. EyeDetect® Certified.

CJA Panel Vendor Federal · Harris · Fort Bend EyeDetect® Certified PCSOT Certified Minority Women-Owned Bilingual EN/ES
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Dr. Celvin G. Walwyn
Dr. Celvin G. Walwyn, Ph.D.
Executive Director & Lead Investigator
  • Retired International Police Commissioner
  • Retired Texas Police Chief (2026)
  • Ph.D. — Summa Cum Laude, Highest Honors
  • Certified EyeDetect® Examiner (Converus)
  • PCSOT Certified
  • Active TCOLE Master Peace Officer License
  • Licensed Private Investigator (TX)
  • CJA Panel Vendor — SDTX, Harris, Fort Bend
  • Bilingual: English & Spanish
38+
Years Law Enforcement
3
Court Jurisdictions
95%
EyeDetect® Accuracy
100%
Bilingual Capable
A Message to Defense Counsel

Your Client's Freedom May Depend
On What You Haven't Found Yet.

Law enforcement investigations are built to secure convictions — not to find the truth. Every case file that crosses your desk was assembled by an agency with a predetermined conclusion. IAI was built to read those files the way the agency never wanted anyone to.

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The PSI Report Your Client Can't Afford to Ignore

Probation officers compile PSI reports from flawed records and incomplete interviews. Misclassified priors, inflated criminal history scores, and missing mitigation factors are standard — and they add years. IAI reviews every line before it reaches the judge.

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The Witnesses Law Enforcement Didn't Want Found

Investigating agencies control which witnesses get documented. The ones who contradict the narrative get overlooked — or discouraged. IAI locates, interviews, and preserves the statements your case file never included.

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The Policy Violations That Change Everything

Every law enforcement agency has written SOPs, training standards, and use-of-force policies. Dr. Walwyn spent four decades writing and enforcing them. He knows exactly where to look — and what a violation means for your case.

"The difference between a fair sentence and an unjust one is often not what the jury heard — it's what no one looked for. IAI looks."

— Dr. Celvin G. Walwyn, Ph.D. · Executive Director, IAI

IAI is a CJA Panel Vendor in the Southern District of Texas, Harris County, and Fort Bend County.
Court-appointed counsel can retain IAI directly.

Refer a Case to IAI (407) 341-2778
What We Do

Our Services

IAI provides full-spectrum investigative support to criminal defense attorneys — from case file review and witness location to credibility assessment and expert testimony.

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Pre-Sentence Investigation (PSI) Review
Independent review and analysis of PSI reports. We identify factual errors, guideline miscalculations, and mitigating factors before sentencing — giving defense counsel a decisive advantage at the most critical stage of the case.
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Mitigation Investigation
Comprehensive background investigations uncovering mental health history, trauma, family dynamics, and character witnesses. We build the full picture courts need to sentence fairly.
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EyeDetect® Credibility Assessment
Scientifically validated, non-contact credibility testing with up to 95% accuracy. Faster and less invasive than traditional polygraph. Ideal for client screening and defense preparation.
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Expert Witness & Testimony Support
Dr. Walwyn's command-level law enforcement background qualifies him to provide expert analysis on police procedures, use of force, investigative standards, and agency policy compliance.
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Bilingual Field Investigation
Full investigative services in English and Spanish — witness interviews, statements, and case documentation. No language barrier. No third-party interpreter. Conducted by our licensed bilingual investigator.
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Subject Location & Witness Interview
We locate and interview witnesses law enforcement may have missed, ignored, or discouraged — building the alternative narrative your client deserves with documented, preserved statements.
Service Spotlight

Pre-Sentence Investigation Review

What Is a PSI Review — and Why Does It Matter?

A Pre-Sentence Investigation (PSI) report is prepared by a probation officer and submitted to the judge before sentencing. It covers the defendant's criminal history, personal background, offense conduct, and a recommended guideline range. Courts give it significant weight.

The problem: PSI reports contain errors. Factual mistakes, misclassified prior convictions, overstated criminal history scores, and missing mitigating factors are common — and they can mean the difference of years in a sentence.

IAI conducts an independent, line-by-line review of the PSI to identify every discrepancy, challenge every unsupported assertion, and document every mitigating factor the report overlooked. We deliver a written analysis defense counsel can use at sentencing.

Request PSI Review
Criminal History Audit
We verify every prior conviction listed in the PSI — jurisdiction, offense level, disposition, and applicable guideline scoring. Misclassified priors inflate criminal history scores and sentencing ranges.
Factual Error Identification
Probation officers compile PSIs from law enforcement records, interviews, and databases. Each source can introduce errors. We identify and document every factual inaccuracy before sentencing.
Mitigating Factor Development
Mental health history, trauma, family circumstances, employment history, and community ties all constitute mitigating factors. We investigate and document what the probation report left out.
Written Analysis Report
IAI delivers a formal written analysis of the PSI that defense counsel can reference directly in sentencing objections, motions, and oral argument before the court.
Federal & State Cases
Available for federal cases under U.S. Sentencing Guidelines and state cases in Harris County, Fort Bend County, and surrounding jurisdictions. CJA-eligible for appointed counsel.
Technology-Backed Assessment

EyeDetect® Credibility Assessment

EyeDetect® is a next-generation credibility assessment tool developed by Converus that measures changes in eye behavior — pupil dilation, blink rate, reading patterns — to detect deception. It is non-invasive, requires no physical contact, and produces results in under 30 minutes.

IAI has two Converus-certified EyeDetect® Examiners on staff. We use this technology for client pre-screening, statement credibility evaluation, and defense preparation — providing defense attorneys with objective, science-backed data about their client's account.

95%
Accuracy Rate
30
Min. Test Time
2
Certified Examiners
0
Physical Contact
Non-Contact Assessment
No wires, no sensors, no physical attachment. The examinee simply reads questions on a screen while the eye-tracking camera does the work.
Scientifically Validated
Published peer-reviewed studies support EyeDetect®'s accuracy. Developed at the University of Utah and refined through thousands of independent examinations.
Defense-Oriented Application
Used for client credibility screening before trial, evaluating witness statements, and providing defense counsel with independent assessment data ahead of plea negotiations.
PCSOT Certified Administration
IAI also offers PCSOT-compliant testing for supervised release compliance, administered by our PCSOT-certified examiner.
Meet the Team

The IAI Team

Every IAI engagement is handled by licensed, credentialed professionals with real-world backgrounds in law enforcement, corrections, and behavioral science.

Dr. Celvin G. Walwyn
Dr. Celvin G. Walwyn, Ph.D.
Executive Director & Lead Investigator
  • Retired International Police Commissioner
  • Retired Texas Police Chief (2026)
  • Ph.D. — Summa Cum Laude, Highest Honors
  • Certified EyeDetect® Examiner (Converus)
  • PCSOT Certified
  • Active TCOLE Master Peace Officer License
  • Licensed Private Investigator (TX)
  • CJA Panel Vendor — SDTX, Harris, Fort Bend
  • Bilingual: English & Spanish

Dr. Walwyn combines nearly four decades of senior law enforcement leadership with the advanced expertise of a Ph.D. in Public Safety Leadership — specializing in Police Leadership (Summa Cum Laude, Highest Honors). This rare convergence of academic rigor and command-level experience defines every IAI investigative engagement.

His career includes serving as International Police Commissioner for the Federation of St. Kitts and Nevis, where he held responsibility for National Law Enforcement, Immigration and Border Patrol, the Port Authority, and the nation's Chief Licensing Authority. He subsequently directed all police operations as Deputy Commissioner of Police for the U.S. Virgin Islands Police Department, and concluded his distinguished public service career as a Texas Police Chief, retiring in 2026.

This command-level background gives Dr. Walwyn an unparalleled understanding of how law enforcement investigations are structured, how agencies operate from the inside, and where systemic gaps most often appear. As a licensed private investigator and CJA Panel Vendor, he applies this depth of experience to deliver precise, strategic, and academically grounded investigative results — uncovering what traditional approaches routinely miss.

A.D. Walwyn
A.D. Walwyn, M.Sc.
Owner & Senior Investigator
  • Licensed Private Investigator (TX, since 2021)
  • M.Sc., Security Management
  • Certified EyeDetect® Examiner (Converus)
  • Bilingual: English & Spanish
  • Owner — Minority Women-Owned Business

As owner of IAI, A.D. Walwyn brings 12 years of direct experience inside Harris County Corrections — managing the booking and release of county inmates. That institutional knowledge of the Harris County detention system is a direct asset to defense practitioners handling clients at every stage of the criminal justice process. She is one of two Converus-certified EyeDetect® Examiners on the IAI team.

Earl A. Campbell
Earl A. Campbell, B.Sc.
Investigator
  • Licensed Private Investigator (TX)
  • 5 Years Investigative Experience
  • B.Sc., Psychology
  • Specialization: Mental Health Counseling

Earl Campbell brings a behavioral science perspective that distinguishes IAI from traditional investigative firms. His background in psychology and mental health counseling informs witness interviews, subject assessments, and credibility evaluation support — skills directly applicable to complex criminal defense matters where mental health is a mitigating factor or central to the case narrative.

Court-Approved

Tri-Level Court Authorization

IAI is authorized as a CJA Panel Vendor across three court jurisdictions — allowing court-appointed attorneys to retain IAI directly for client investigations.

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Southern District of Texas
Federal CJA Panel Vendor. Available for court-appointed criminal defense matters in the Southern District, including Houston, Laredo, McAllen, Victoria, and Corpus Christi divisions.
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Harris County
Authorized vendor for court-appointed criminal defense investigators in Harris County, Texas — one of the largest criminal justice systems in the United States.
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Fort Bend County
Authorized vendor for court-appointed criminal defense investigations in Fort Bend County, serving appointed defense counsel in the county courts at law and district courts.
Common Questions

Frequently Asked Questions

How does an attorney retain IAI for a court-appointed case?
If you are court-appointed in the Southern District of Texas, Harris County, or Fort Bend County, you can retain IAI directly through the CJA panel process. Contact us at admin@iahotx.com with the case caption, court, and assigned judge. We will provide a service agreement and cost estimate for CJA authorization.
What is the difference between EyeDetect® and a polygraph?
EyeDetect® measures ocular-motor responses — changes in pupil dilation, eye movement, and blinking — rather than physiological responses like heart rate and breathing. It requires no physical contact and produces results in under 30 minutes. Published studies report accuracy rates up to 95%. IAI does not offer traditional polygraph — we are certified EyeDetect® examiners through Converus.
Can IAI provide bilingual investigative services?
Yes. A.D. Walwyn, M.Sc., our Senior Investigator, is fully bilingual in English and Spanish. She conducts witness interviews, subject assessments, and case documentation in both languages — with no third-party interpreter involved.
What is a Pre-Sentence Investigation Review?
A PSI review is an independent, line-by-line analysis of the probation officer's pre-sentence report prepared before federal or state sentencing. IAI examines the report for factual errors, misclassified criminal history, unsupported sentencing guideline calculations, and overlooked mitigating factors. We deliver a written analysis that defense counsel can use in sentencing objections and argument.
What services does IAI offer?
IAI provides pre-sentence investigation review, mitigation investigation, EyeDetect® credibility assessment, expert witness services, subject location and witness interviews, and bilingual field investigation. All services are available to court-appointed and privately retained criminal defense attorneys.
Is IAI a Minority Women-Owned Business?
Yes. IAI is majority-owned (51%) by A.D. Walwyn, M.Sc., a licensed Texas private investigator, and qualifies as a Minority Women-Owned Business. This designation may be relevant to attorneys and public defender offices with diversity procurement requirements.
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Contact Us

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Website
iahotx.com
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Jurisdictions
Southern District of Texas · Harris County · Fort Bend County
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TX PI License
A19944401
📋 Download Retainer Agreement TX DPS Consumer Complaint Notice
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