Business Details
44 Years
experience
Professional Polygraph & Private Investigation Services in Houston
At Hendricks Polygraph, we have dedicated over four decades to delivering professional polygraph examinations and investigative services. Our founder, Kelly B. Hendricks, began his law enforcement career with the Harris County Sheriff's Office and has since established a reputation for excellence in truth verification and criminal investigations. With advanced training exceeding 5,000 hours and recognition as a Master Peace Officer by the Texas Commission on Law Enforcement, we serve law enforcement agencies, legal professionals, and private clients across Houston and the Texas Gulf Coast. Our approach combines reliability, responsiveness, and respect for individual rights, ensuring clients receive accurate results and discreet investigative support. We maintain active leadership roles in professional organizations such as the Texas Association of Polygraph Examiners and the American Polygraph Association.Our services span criminal and civil litigation support, sexual offender testing, pre-employment screenings, and domestic infidelity investigations conducted in collaboration with licensed counselors. As a licensed entity regulated by the Texas Department of Public Safety, we adhere to strict ethical standards while providing tailored solutions for complex cases. Our track record includes contributions to high-profile criminal prosecutions and comprehensive risk assessments for private security sectors. We remain committed to advancing truth verification through continuous professional development and community service. This dedication has solidified our position as a trusted resource for polygraph and investigative needs in Texas.
Services
Polygraph Testing
Private Investigations
Sexual Offender Testing
Pre-Employment Screening
Civil Litigation Support
Criminal Defense Investigations
Surveillance Services
Background Checks
Details
- Year established: 1982
Highlights and features
- We offer 40+ years of law enforcement investigative experience and polygraph expertise.
- Our team holds leadership roles in major professional polygraph associations.
- We provide specialized testing for sexual offender and post-conviction cases.
- Our services are utilized by law enforcement agencies across five Texas counties.
- We maintain Master Peace Officer certification with advanced forensic training.
Associations and certifications
- American Polygraph Association
- Texas Association of Polygraph Examiners
- Texas Association of Law Enforcement Polygraph Investigators
- Texas Joint Polygraph Committee on Offender Testing
- Texas Association of Licensed Investigators
Services
Polygraph Testing
Professional polygraph examinations for criminal investigations, civil litigation, and attorney support. Our certified examiners utilize advanced techniques to verify truthfulness and detect deception. Services include pre-employment testing, sexual offender assessments, and domestic infidelity evaluations conducted with licensed counselor collaboration.
Private Investigations
Comprehensive investigative services for legal cases, corporate needs, and private matters. We conduct surveillance, background checks, and evidence collection for civil litigation, criminal defense, and child custody cases. Our team provides photographic documentation and detailed written reports for court proceedings.
Sexual Offender Testing
Specialized polygraph examinations for sexual offender monitoring and post-conviction compliance. Our services support parole officers and treatment programs with accurate deception detection. We participate in the Texas Joint Polygraph Committee on Offender Testing to maintain industry standards.
Pre-Employment Screening
Thorough vetting services for corporate clients including fingerprinting, criminal history verification, and personal information validation. We conduct comprehensive background investigations for security-sensitive positions and government contractors requiring high-level clearances.
Civil Litigation Support
Investigative support for attorneys handling civil cases including personal injury, wrongful death, and fraud claims. Our services include witness statements, asset location, and surveillance documentation to strengthen legal arguments and settlement negotiations.
People
Kelly B. Hendricks
Founder & Chief Polygraph Examiner
With over 40 years of law enforcement experience, Kelly B. Hendricks is a Master Peace Officer certified by the Texas Commission on Law Enforcement. He established Hendricks Polygraph in 1982 after serving as a homicide detective and has held leadership roles in multiple polygraph associations. His expertise includes 5,000+ hours of advanced training and contributions to high-profile criminal prosecutions.
Questions
What polygraph services do you offer?
We provide polygraph testing for criminal investigations, civil litigation, attorney support, sexual offender monitoring, and domestic infidelity cases with licensed counselor collaboration.
Are your examiners certified?
Yes, our examiners hold certifications through the American Polygraph Association and maintain Master Peace Officer status with the Texas Commission on Law Enforcement.
What private investigation services are available?
We offer surveillance, background checks, witness statements, asset location, and case documentation for civil litigation, criminal defense, and corporate security needs.
Do you serve areas outside Houston?
While based in Houston, we serve clients throughout Harris County, Montgomery County, Brazos County, and the broader Texas Gulf Coast region.
How are polygraph results used in court?
Our polygraph results are admissible as evidence when both parties agree to their submission. We provide detailed reports that attorneys use to support criminal defense or prosecution strategies.
Reviews (1)
Johnathan Tallent
Jan 19, 2017
Report
Theft
I volenteered to go and take the Lie Dectector test because I had nothing to hide- well of course the worst possible thing ocurred, I FAILED. After not passing the tester, David, became very agressive pressuring me to admit something I didn't do. At the end of day the jewelry was found providing evidence I was telling the truth and disproving the polygraph in all its glory. Save your money and time this place and the process is a scam.
-- update
Also, after calling around to hire a defense attorney- multiple lawyers mentioned they don't use this place due to a questionably high failure
I volenteered to go and take the Lie Dectector test because I had nothing to hide- well of course the worst possible thing ocurred, I FAILED. After not passing the tester, David, became very agressive pressuring me to admit something I didn't do. At the end of day the jewelry was found providing evidence I was telling the truth and disproving the polygraph in all its glory. Save your money and time this place and the process is a scam.
-- update
Also, after calling around to hire a defense attorney- multiple lawyers mentioned they don't use this place due to a questionably high failure
