Polygraph Testing in Relationships: When It Helps and When It Makes Things Worse

Of all the polygraph work conducted through In Depth Polygraphs, relationship testing generates the strongest reactions — from the couples involved and from people who have never sat in the room. It deserves an honest treatment rather than either the television version or a blanket dismissal.

Why Couples Come In

Almost always because one partner has confessed to something and the other cannot establish whether the confession is complete. That is the situation polygraph is actually suited to: a specific, bounded factual question that both parties agree needs an answer, where the alternative is years of unresolvable suspicion.

When It Works

It works when both people attend voluntarily, when the issue can be reduced to one clear question, when both agree in advance what they will do with either result, and when there is professional support — usually a therapist — already involved. Under those conditions, a great many couples leave the office with something they have not had in months: a shared factual baseline to build from.

When It Should Be Declined

• One partner is being coerced into attending — coerced tests are invalid and abusive
• There is any indication of controlling or violent behaviour in the relationship
• The requesting partner cannot say what they would do with a "no deception" result
• The question keeps expanding — a moving target cannot be tested
• Repeat testing is being used as a monitoring tool rather than a resolution

A responsible examiner turns work away on these grounds regularly. Polygraph used as an instrument of control is not polygraph, and the room should not be rented to it.

The Television Version

Broadcast formats built around couples and lie detection — including the UK series covered by The Sun — deliver genuinely surprising results, and the examinations are run to full standard. What the format necessarily compresses is everything around the test: the counselling, the deliberation, and the long aftermath that follows either answer. Viewers should understand they are watching twenty minutes of a process that lasts months.

The Result Is a Beginning

The single most important thing said in the pre-test interview is this: the chart will not tell you whether to stay. It answers one factual question. What follows is a decision that belongs entirely to the two people in the room, and it is worth having a professional lined up to help them make it.

Relationships involving control, coercion or violence require specialist support rather than testing. If that describes your situation, speak to a domestic abuse service before anything else.

About the author

Dan Ribacoff is a licensed private investigator and the founder of International Investigative Group, a certified polygraph examiner, certified firearms instructor, GIA Graduate Gemologist and the author of I, Spy: How to Be Your Own Private Investigator. He works from offices in New York, Boca Raton and London, and has appeared as a polygraph expert on American and British television.