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About us
Liecatcher was founded in 2005 and ever since  it has been providing professional lie detection, internal investigations and teaching around the world .
All examiners are accredited and
have years of experience in the field.
The company has provided services in: 
Bulgaria, Colombia, Costa Rica, El Salvador, Ethiopia, Guatemala, Israel, Mexico, Poland, Russia ,Singapore, Thailand, South Africa  and the United States.


Types of polygraph tests

Pre Employment  Verification tests

Monitoring/Periodic tests

Specific incident tests

Sex offender tests

Computerized integrity tests


Other Services

Quality control reviews

Expert witness testimony

Polygraph examiner training courses

Internal investigations

Polygraph Instrument sales


Contact Us



All Cell numbers can be reached by WhatsApp



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Tuvia Shurany
Mr. Shurany is the founder and owner of Liecatcher Polygraph Services.
Tuvia has over 30 years of experience in all types of polygraph tests.
He is a member of six international polygraph associations, and has served as an APA accredited school director three times, primary instructor.  Mr. Shurany is available for quality control reviews and international consultantations.
Fabiola Chaves 
Ms. Chaves is a partner in Liecatcher Polygraph Services. She has been a 
polygraph examiner since 2002, and is a graduate of an APA accredited  training facility.  Fabiola had successfully trained in post convicted sex offender testing.
In addition, she is a specialist in auditing investigations and testings, and is experienced in testing Deaf Mute examinees.

We are proud members of the following associations .

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Tuvia Shurany is the author of "Evaluation of Polygraph Charts: Formats, Criteria and Scoring." The book shows evaluation criteria,  formats and has numerous examples for practice. 

The book is recommended as a valuable handbook by Cleve Backster and Dr. James Allan Matte.  The book is also available in Spanish.

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The "Pre-test Interview; the foundation of Polygraph," shows the proper way of performing a pre-test interview and written by Tuvia Shurany & Nathan J. Gordon.  The book is also available in Spanish.

Publications in the European Polygraph Journal by Mr. Shurany  and Ms. Chaves:

  • Influence of Case Facts on Blind Scorers of Polygraph Tests.

  • A Field Study on the Validity of Quadri-Track Zone Comparison Technique.

  • Confirmed Mental Countermeasure Case in Costa Rica

  • Polygraph verification test.

  • Testing Deaf Mute Examinee in Costa Rica.

  • The Integrated Zone Comparison Technique and ASIT.

  • Utilizing the Polygraph Validation Test (PVT) In Solving Conflicted Polygraph Results and Confirming results with PVT.

  • Confirming Deliberate Distortions by Examinees.

  • Anticlimax Dampening Concept – Does Exist.

What is a polygraph test?

A polygraph test is a semi scientific procedure in order to verify the truthfulness of a person regarding certain questions he or she is asked.
The procedure is divided into three parts:
Pre-test interview - this part is dedicated to explain to the examinee how the system works. The examiner will familiarize the examinee with the questions he or she will be asked during the examination.
Data Collection - the examiner will attach four sensors to the examinee over the clothes (a chest sensor and abdominal sensor two finger electrode and a cardiovascular cuff). After attaching the sensors the examiner will collect 2 to 4 charts of physiological data. The examinee must sit still without any movement as unobserved movement can show a reaction which can be interpreted as a lie.
Conclusion - After collecting the data the examiner will evaluate the charts and determine the truthfulness of the examinee.
Can the test harm the examinee?
A polygraph test can not affect a person's health! If  you  have any health problems inform the examiner.
How long does it take?

Allow yourself at least two hours for the test.  Arrive at the polygraph laboratory at least 10 minutes before your scheduled appointment.

The test itself can take between 60 and 90 minutes and in some cases even more.

There examiner cannot  take any shortcuts, since doing so might affect the accuracy of the result.

In case you don’t have the required amount of time for a proper test to be conducted, ask for the test to be re-scheduled.


As a client, what are my benefits from using the service?

Clearing the name of an innocent person, employee or company from false accusations.

Assist clients in loss prevention procedures.  This service has already proven itself effective and reduced losses by thousands of dollars.

Gives an employer a good tool for identifying the best applicants, ensuring the integrity and work ethic of existing employees, and when specific incidents occur allows suspicion to be removed from honest employees, and for the immediate identification of culpable employees.

 Training courses

Liecatcher provides the following types of training:

  1. Basic polygraph training accredited by the International Society of Polygraph Examiners and the American Polygraph Association.

  2. Advanced training for polygraph examiners.

  3. Polygraph examiners continuing education seminars.

  4. Interview skills (including pre-employment interview, background verification and how to understand and effectively utilize verbal and nonverbal behavior).


Integrity exams 

An integrity test is based on a computerized questioner which has the capability to analyze the interviewee's state of mind regarding varies aspects.

The service can be obtained in two forms:


  1. Receiving the computerized report.

  2. We can also interview the person based on the computerized and present a full report based on the verbal and computerized outcome.  


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