Polygraph Manufacturers

Lafayette Instrument Company holds the largest market share in the polygraph industry and is the preferred supplier for numerous federal agencies, law enforcement departments, and private polygraph practices worldwide. Founded in 1947 by Max Wastl in Lafayette, Indiana, the company evolved from a small psychology instruments shop into the global leader in credibility assessment technology. In 2022, Lafayette acquired Limestone Technologies, uniting two of the most respected brands in polygraphy and significantly expanding their product portfolio. Lafayette also operates the PEAK Credibility Assessment Training Center in Cape Coral, Florida, offering APA-compliant examiner training. All our examiners at Lie Detector Test use Lafayette or Limestone systems across our 140+ testing locations.

Stoelting Company has been a cornerstone of the polygraph industry for nearly a century. The company introduced the Polyscribe in 1974 — the first fully electronic polygraph instrument — and the Ultrascribe in 1979, setting the standard for electronic recording in polygraph science. Stoelting launched its first scoring algorithm in 1992 and today manufactures the CPSpro Fusion software, widely regarded as one of the most complete polygraph software platforms available. Their CPS Elite Series represents the current generation of hardware, featuring built-in display technology and state-of-the-art electronics. Stoelting systems are particularly popular in polygraph training academies, military security units, and state law enforcement agencies, valued for their durable hardware design and intuitive interface.

Axciton Systems holds a pivotal place in polygraph history as the company that launched the first commercially viable computerised polygraph system in 1990, developed in collaboration with Johns Hopkins University Applied Physics Laboratory. This partnership also produced the original PolyScore algorithm — the first automated polygraph scoring system to achieve widespread adoption. Axciton's proprietary STAR (Statistical Test Analysis Report) algorithm and Motion Sensor Pad technology offer industry-leading resistance to physical countermeasures, making their systems particularly suited for controlled single-issue testing environments. Axciton instruments are widely used by government agencies, law enforcement, and private examiners who prioritise countermeasure detection capability.

Limestone Technologies built its reputation on delivering some of the highest-resolution polygraph systems in the industry, with sampling rates exceeding 600 Hz per channel — offering exceptional signal granularity for forensic-grade physiological analysis. The company's ParagonX system became particularly popular in PCSOT (Post-Conviction Sex Offender Testing) programs, clinical settings, and high-volume monitoring environments due to its waveform fidelity and intuitive Polygraph Pro Suite software. Limestone was acquired by Lafayette Instrument Company in September 2022, bringing together two of the most trusted brands in polygraphy. The ParagonX system continues as a supported product line within the Lafayette family, and Limestone's ESS-M scoring algorithm is now integrated across both platforms. Trade-in programs offer up to $2,700 credit for older models or competitor systems.