Polygraph - Lie Detector in Spain

Professional polygraph testing in Spain: Madrid, Barcelona, Valencia, Alicante, and nationwide. We work directly with clients. Employee screening, family investigations, relationship issues, theft, and forensic examinations.

We are a team of professional polygraph examiners.

“Interpolys” is a professional lie detection service for businesses and individuals throughout Spain. We uncover the truth when words raise doubts. Our experts, with international experience, guarantee high accuracy and 100% confidentiality. We protect your assets, your reputation, and your personal relationships by providing objective evidence in the most complex situations.

Individuals

Test for infidelity

from 350 €

Checking domestic staff

from 350 €

Investigation into thefts

from 500 €

View all services

Organisations

Pre-employment screening

from 350 €

Routine check of current staff

from 350 €

Protecting honour and dignity

from 400 €

View all services

Our Experts

A team of in-house specialists. We do not resell services; instead, we provide them ourselves, taking full professional responsibility for every result in Alicante.

ANDREW DIAK

Polygraph examiner, 15 years’ experience

Higher education, practical psychology

Oleg Smolnitsky

Polygraph examiner, 5 years’ experience

Higher education, practical psychology

Arnold Eduardo Burgos

Polygraph examiner, 14 years’ experience

Higher education, practical psychology

Quick Answers

Here are the 12 most frequently asked questions (FAQ)

How long does it last?

About 90–120 minutes.

Does it hurt?

No, it is completely painless.

What should I wear?

Comfortable clothing.

Can I drink coffee before?

Yes, in moderate amounts.

Presence of 3rd parties?

They can wait outside.

Can it be done at home?

Yes, provided standards are met.

Results immediately?

Verbally — sometimes; report within 24h.

Is it confidential?

Completely. For the client only.

Can it be canceled?

Yes, but the deposit is non-refundable.

Are there discounts?

Yes, for couples or groups.

Does it work when nervous?

Yes, lies [physiological responses] differ.

Can it be retaken?

Yes, if the result is unclear.

What happens during a lie detector test?

The stages of a standard polygraph test procedure

INITIAL ASSESSMENT AND CONSULTATION

You submit a request via INTERPOLYS’ official channels. Our experts conduct a preliminary assessment of your situation, identify the key risks and draw up a strategic action plan for the upcoming investigation.

APPROVAL OF THE MINUTES

At this stage, we define the specific objectives of the audit and set out the terms and conditions of our collaboration. We work through the legal and organisational aspects in detail, ensuring complete transparency of the process for the client.

SELECTION OF QUESTIONS AND METHODS

INTERPOLYS’ specialists tailor their methods to your specific case. We develop a unique verification algorithm that takes into account the psychological profile of the person being interviewed and the specific nature of the facts being verified.

EXPERT TESTING

The procedure takes between 90 and 150 minutes. During the session, state-of-the-art lie detection techniques are used to rule out any random errors. The process is conducted in strict accordance with international standards of ethics and safety.

PREPARATION OF THE FINAL REPORT

An official expert report is being prepared based on the results of the audit. The document is sent via secure communication channels. INTERPOLYS guarantees absolute confidentiality and exclusive access for the client to the data obtained.

TECHNICAL SUPPORT

We use state-of-the-art, high-precision hardware and software systems. Monitoring includes: respiration sensors, a cardiovascular activity sensor, a skin conductance sensor, a blood pressure sensor and a tremor sensor.

Download the full guide

Do you have any further questions?

Trust
starts with honesty

Book a polygraph test today and get clear answers to your questions.

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Our competitive advantages

We work directly with you: expert supervision with no middlemen.

— You deal directly with the service provider, with no mark-ups or agency fees.
— Direct contact with an expert: specialist training.
— The specialist takes personal responsibility for the accuracy and objectivity of the report.
— Rapid response times and complete data confidentiality.

High-level professionalism

— All specialists hold a relevant higher education qualification.
— Average length of service in the sector: 7 years or more.
— They undergo professional development training every year.
— Strictly adhere to international testing methodologies.

State-of-the-art technical equipment

— We use certified polygraphs.
— State-of-the-art equipment.
— Results are 95–98% accurate.
— Licensed software.

Complete confidentiality and security

— We guarantee 100% anonymity.
— Checks are carried out only with voluntary written consent.
— We operate in strict compliance with international law.
— Ethical requirements and professional standards.

We operate in accordance with the standards set out at

Feedback from our customers

Trust is built on honesty. Here you can read real stories from people who have undergone a polygraph test and shared their experiences.

Carlos R. Madrid, España

We contacted you because of unexplained losses within the company. A polygraph examiner conducted tests on key staff members. The whole process was handled with great sensitivity and without any pressure. In the end, we managed to identify the person involved without damaging the working atmosphere within the team. It was money well spent.

Miguel Á. Valencia, España

The situation, involving suspicions of infidelity, was on the verge of leading to a divorce. My wife agreed to the test of her own accord. The specialist showed incredible empathy and professionalism. The result helped us rebuild our trust and start afresh. I wish we’d done this sooner.

Roberto S. Barcelona, España

I was falsely accused of theft at work, and my reputation was at stake. I insisted on taking a polygraph test myself to prove my innocence. The examiner explained everything in detail, and I felt hardly any stress. The report confirmed that I was telling the truth, and now I have an official document

Elena V. Marbella, España

We were looking for a nanny for our child through an agency, but decided to play it safe and carry out a background check. A polygraph examiner helped us draw up a list of questions about her previous experience and any hidden habits. This gave us a peace of mind that no number of reference letters could provide.

Diego L. Madrid, España

As an HR director, I used their services to conduct an internal investigation into a leak of confidential information. I was impressed by their discretion—the specialists arrived without any identifying badges, and the report was ready quickly and included a unique verification code. Very professional.

Jorge M. Аліканте, España

It was a complex case involving the division of an estate and allegations of concealing assets. The polygraph test proved to be the decisive factor. The procedure took around three hours, but the result settled the matter once and for all and helped avoid years of legal wrangling.

Anna S. Malaga, España

I took a test to prove my honesty to a business partner ahead of a major deal. At first, I was worried that my nerves might affect the result, but the expert reassured me, saying that the device can distinguish between normal stress and an attempt to deceive. Everything went smoothly.

Polygraph - Lie Detector in Spain

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We are a team of professional polygraph examiners.