EPPA

What Is EPPA?

EPPA (Employee Polygraph Protection Act of 1988) is a legal concept related to polygraph testing. A U.S. federal law that prohibits most private-sector employers from requiring, requesting, or using lie detector test results as a condition of employment. Exemptions apply to federal, state, and local government employers, certain security-related industries, and investigations involving economic loss or injury. Violations carry civil penalties up to $10,000. See our complete EPPA guide for detailed information.

Legal Context and Significance

The legal framework surrounding polygraph testing varies significantly by jurisdiction. In the United States, the admissibility of polygraph evidence is governed by either the Daubert standard (in federal courts and many state courts) or the Frye standard (in some remaining state courts). The Employee Polygraph Protection Act regulates the use of polygraph testing in private-sector employment.

Understanding these legal standards is essential for examiners, attorneys, and anyone involved in cases where polygraph evidence may be presented. The legal status of polygraph testing continues to evolve as the scientific evidence base grows and courts reconsider historical positions.

Practical Implications

For examinees considering a lie detector test, understanding the legal context is important for setting appropriate expectations. The legal weight of polygraph results depends heavily on the jurisdiction, the purpose of the examination, and whether the results are stipulated (agreed upon by both parties in advance) or un-stipulated. A qualified, APA-member examiner can provide guidance on how results may be used in specific legal contexts.

Related Terms

Understanding EPPA in context requires familiarity with several related polygraph concepts:

See also: Daubert Standard, Evidentiary Testing, Frye Standard, Federal Polygraph Programs, Licensure, NAS Report.

Further Reading

For more information on polygraph terminology and the science of lie detection, explore the full Polygraph Glossary with over 250 defined terms. Visit the Polygraph Examiner Hub for professional resources, the research database for published polygraph studies, or learn how a polygraph works if you are preparing for an examination.

Key Takeaways

EPPA is an important concept within the field of Psychophysiological Detection of Deception. Whether you are a polygraph examiner, student at an APA-accredited training program, legal professional evaluating polygraph evidence, or a private individual preparing for a lie detector test, understanding this term and its relationship to other polygraph concepts will help you navigate the field with greater confidence and knowledge.

The science of polygraph testing has evolved significantly over more than 100 years, from the early work of William Moulton Marston and Leonarde Keeler to today's digital instruments and validated scoring algorithms. Every term in this glossary represents a piece of that scientific and professional heritage. For a comprehensive overview, visit the Polygraph Examiner Hub or use our examiner selection guide to find a professional examiner near you.