Government Licensed
40 Years Experience
in Lie Detection
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Lie Detector Tests

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Polygraph Training

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Polygraph Sales

Investigation Private Investigation


Employee Theft Employee Theft

Solve Theft Cases

Bunker Survey Bunkder Survey

Detect and Deter Corruption


    Koa Fung Chew, PPA, PBS, founder and Director of Polygraph Investigative Services, is a retired Superintendent of Police with the Singapore Police Force with more than 48 and 40 years of practical experience in interviewing and polygraph testing respectively. While in active service, he held senior positions, including Chief Polygraph Examiner and Head of the specialist Interrogation Unit in the Ministry of Home Affairs where he dealt with important criminal cases, terrorism, espionage, internal investigations, personnel screening etc.

     A certified polygraph examiner and polygraph instructor, he was the first Singaporean to be trained in the polygraph. He received his polygraph training in 1977 at the American Institute of Polygraph Technology and Forensic Psychophysiology at Michigan, USA and the Israel Polygraph Institute. He had subsequently served as a government polygraph consultant for many years.

    Since 1974 till now, Supt (Ret) Koa has also trained more than a thousand local as well as foreign law enforcement officers in the art of interrogation and interviewing. (See details and list of prominent Government clients).

    Always results-driven, Supt (Ret) Koa has helped government agencies as well as private sector organisations crack many important high profile cases with his interviewing and polygraph skills. He travels overseas frequently to help government agencies, multi-national corporations, top legal firms, millionaires, and ordinary private individuals to solve difficult cases, especially cases involving corporate "insider crimes" like theft, sabotage and corruption.

     Supt (Ret.) Koa is a qualified Primary Instructor and the Assistant Director at the American Institute of Polygraph Technology and Forensic Psychophysiology, Michigan, USA. He has trained a few hundred government polygraph examiners, including those from Singapore, China, Brunei, Malaysia, Indonesia and Thailand. He is the current Vice President (Private) of the Singapore Association of Polygraphers and a member of the British & European Polygraph Association (BEPA).

    For his outstanding service to the Singapore government, Supt (Ret.) Koa has won many national awards, including the Public Administration Medal (Bronze), Minister of Home Affairs Commendation Certificate for work excellence, Good Service Medal, and Commissioner of Police Commendation and High Commendation Certificates.

    For his service to the government after his retirement, he was awarded the Minister of Home Affairs Commendation Certificate in 2003. (Please see photo gallery below.)

     Supt (Ret.) Koa comes from Electronics Engineering background. Although he belongs to the Pioneer Generation of Police Officers, he makes it a point to update his professional skills and knowledge by attending seminars and courses. He has a passion for computer programming and Internet Technology. The programme codes for this responsive design website is written by him.



Ret. Supt Koa Conducted Polygraph Course for Thai Police Forensic Department in Bangkok in Dec 2017


Fann Wong

Ret. Supt Koa provides expertise for film production with renown Actress Fann Wong in Mar 2018


Our Polygraph Examiners

    Our team of local and foreign Polygraph Examiners are highly experienced and qualified. They have extensive experience in law enforcement and corporate cases. Our team includes professional examiners from Singapore, USA and India. We are able to conduct more than 90 lie detector tests per week.

Our Investigation Staff

     Our Team of Investigators and Surveillance Operatives are battle hardened professionals drawn from the ranks of retired and ex-police officers with vast experience in criminal investigations, intelligence gathering and surveillance operations. Each investigator has undergone a rigorous integrity and honesty screening process before joining the company.

    Using time-honoured methods as well as the latest, most up-to-date techniques, our investigators work efficiently and accurately to procure valuable information and reveal the TRUTH in any given scenario without compromising the secrecy of any assignment.

    Our highly skilled surveillance operatives are supported by latest and most sophisticated surveillance devices and have access to intelligence assets to enable the gathering of solid evidence like photos and videos. They are highly motivated and results-driven, and will succeed in operations where others failed.

    In investigations where the services of skillful interviewing and interrogation are required, our team of professional interviewers and interrogators are well trained in the art of interviews and interrogation and are able to extract information from interviewees and record their statements in a format that can be used as evidence in any inquiry.

Our IT And Security Consultants

    Our Team of IT & Security Experts are highly experienced and qualified engineers gleaned from the ranks of security and investigations organisations.

    Their practical knowledge range from the early mainframe computers and PCs to the latest high-end computers, servers, PCs, tablet and mobile devices.

    Their expertise are highly sought by private and government agencies to help to track the electronic footprint, sniff out criminal methods and identify culprits on a daily basis.

    Our experts also provide litigation support services and help in incident management, and systems security enhancement.

polygraph trainging

Supt (Ret) Koa Conducting Test on 5 April 2017

Vacancies for
Qualified Examiners
  • Work in Asia Pacific
  • Good Track Record
  • Part-time & Full-time
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  • Direct Line
    Tel: +65 6737 9117
  • Address:
    Polygraph Investigative Services,
    151 Chin Swee Road
    #03 - 33,
    Manhattan House,
    Singapore 169876.
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polygraph training

Advanced Training at CID

polygraph trainging

Supt (Ret) Koa Training Govt Examiners in China 2009