John Grogan

The Lie Detector Guy

Renowned lie detection expert known for his groundbreaking work in behavioral analysis and truth verification.

With decades of experience, he has trained law enforcement agencies, consulted on high-profile cases, and helped uncover the truth through the power of body language and analysing the human body's actions when lying.

FREE Consultation

We never lie.
Read our testimonials.

Our testimonials are backed by our past clients of whom have consented to praising our services. We would like for you to scroll through their positive remarks.

Backed by users:

“All thanks to him I got a second chance at life! Thank you to John and everyone at the firm for all the support. I would recommend them to anyone in Ohio for all law needs.”

-- Jennifer

Featured Appearances

See all of John Grogan's official media appearances.

YouTube Channels

Hired polygraph examinations for recording sessions; for entertainment purposes.

Dr. Phil

On-air polygraph examinations with the nation renowned Dr. Phil Show.

Meet John Grogan

John Leo Grogan is a nationally respected, highly experienced polygrapher and PI, trusted by government agencies, praised by media, and favored by celebrities for his outstanding skill and integrity. 100% reliable. 0% lies.

Los Angeles polygraph tests since 1980s. 1000+ TV/media appearances. 13,000+ persons tested. TV's 'Lie Detector Guy'.