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General Info
Douglas Mansfield and Jeff Lierly have a combined 80+ years of experience in the fields of law enforcement and polygraph. We are certified PCSOT (Post Conviction Sex Offender Testing) examiners and are actively engaged in testing. We specialize in all types of polygraph examinations, including Law Enforcement Pre-employment, PCSOT, Criminal Investigation (Law Enforcement/Prosecutors/Defense Attorneys, and Private/Infidelity. We are also pleased to announce that we are the only Credibility Assessment Professional in the Sacramento / SF Bay Area to offer EyeDetect, a faster, less expensive and accurate alternative to polygraph. Please call Jeff Lierly at 530.510.3989 for details regarding EyeDetect.

Regular Hours

Lie Detection, Criminal, Public Safety Pre-employment Screening, Post Conviction Sex Offender Testing (PCSOT), Court Qualified Expert, Attorney/Police Testing, Private/Infidelity
**NEW...Now offering EyeDetect services, a faster, less expensive, and accurate solution to polygraph! Go to to learn more about EyeDetect.
Member of the American Polygraph Association Member of the California Association of Polygraph Examiners
Employment Screening, Lie Detection Service, Private Investigators & Detectives, Attorneys Support & Service Bureaus


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