The term “polygraph” literally means “many writings”. The name refers to the fact that selected physiological variables are simultaneously recorded during an examination and evaluated to determine the physiological responses to specific questions that are asked.  Using specialized components, four signals generated from the human body are recorded. Respiratory activity is recorded by corrugated rubber tubes that are placed over the examinees’ chest and abdomen. Electrical or sweat gland activity is reported by two small sensors attached to the fingers or palm. Cardiovascular activity is recorded by a blood pressure cuff or similar device. Finger Plethysmograph measures blood volume.

Polygraphs are currently in use in three sectors of society for various reasons, and always for the purpose of determining the truthfulness of a client or situation. Individuals, families, therapists and employers utilize the polygraph to verify statements and verify the truth in issues such as infidelity, criminal activities, sex offenses, drug use and addictions, employee theft, and many other matters.

Law Firms and Attorneys use polygraph examinations in the pre-court phase and in civil litigation to determine truth in a client's case, verify a client's truthfulness relative to plea negotiations, to assist in general client control and verification of witness statements. Law courts also mandate polygraph examinations on a regular basis for post conviction sex offenders as part of a Treatment Approach. In addition, U.S. Attorney Offices, District Attorney Offices, Public Defender Offices, Defense Attorneys and Parole & Probation Departments all use polygraph examinations.

Local Police, U.S. Military Branches and Government Agencies such as the FBI, CIA, NSA and Department of Defense all use polygraph examinations for applicant screenings, criminal investigations and matters of national security.

At Sleuth Precision Polygraph Services a typical polygraph examination includes the pre-test, a chart collection phase referred to as the in-test, and a data analysis phase. In the pre-test, the polygraph examiner completes required paperwork and provides an introduction to the polygraph instrument and components. During this period, the examiner also discusses why the examinee is taking the polygraph, the test questions that will be asked, and familiarizes the examinee with the testing procedure. During the in-test phase, the polygraph examiner, utilizing a State-of-the-Art Computerized Polygraph system, records a number of charts with various physiological elements while the reviewed questions are presented to the examinee. Following the examination, the examiner analyzes the charts and physiological data and renders a report with the examiner's opinion regarding the truthfulness of the person taking the test.

Depending on availability at our office locations, appointments for polygraph examinations can usually be accommodated with short notice.

Depending on who requested the test, results are provided verbally following the examination in office, or sent to the payor, for legal or treatment purposes. Most often, a written report of the examination results will be produced and sent via USPS Priority Mail or E-mail. In certain cases, official reports can be produced immediately following the examination and provided to the client and or examinee.

Sleuth Precision Polygraph Services adheres to very strict confidentiality and privacy standards. All information from an examination is kept strictly confidential and private.

Polygraph results are admissible in some federal circuit courts and some states. More often, polygraph results are admissible when the parties have agreed to their admissibility under terms of a stipulation.

While the polygraph technique is highly accurate, it is not infallible and errors can occur. According to the American Polygraph Association over 250 studies have been conducted on the accuracy of polygraph testing during the past 25 years. Recent research reveals that the accuracy of the new computerized polygraph system is close to 90-95%.

Most errors occur with inexperienced polygraph examiners. Just as one doctor can look at an x-ray and not see a problem, while the next, more experienced doctor can, so it goes with polygraph charts. Occasionally you will hear reports from those who fear the polygraph may not be accurate. The APA answers them with this:

One of the problems in discussing accuracy figures and the differences between the statistics quoted by proponents and opponents of the polygraph technique is the way that the figures are calculated. At the risk of over simplification, critics, who often don't understand polygraph testing, classify inconclusive test results as errors. In the real life setting an inconclusive result simply means that the examiner is unable to render a definite decision. In such cases a second examination is usually conducted at a later date. To illustrate how the inclusion of inconclusive test results can distort accuracy figures, consider the following example: If 10 polygraph examinations are administered and the examiner is correct in 7 decisions, wrong in 1 and has 2 inconclusive test results, we calculate the accuracy rate as 87.5% (8 definitive results, 7 of which were correct.) Critics of the polygraph technique would calculate the accuracy rate in this example as 70%, (10 examinations with 7 correct decisions.) Since those who use polygraph testing do not consider inconclusive test results as negative, and do not hold them against the examinee, to consider them as errors is clearly misleading and certainly skews the figures.

The United States Department of Defense has stated based on extensive research that the preponderance of scientific evidence clearly demonstrates the Polygraph is far more accurate at detecting deception than is Voice Stress. No Department of Defense Agency uses Voice Stress. Polygraph is the only lie detection technique directly used by Federal Government Agencies.

On December 27, 1988, the Employee Polygraph Protection Act (EPPA) became law. This federal law established guidelines for polygraph testing and imposed restriction on most private employers. The following is a brief summary of the essential elements of the law.

This legislation only affects commercial businesses. Local, State and Federal governmental agencies (such as police departments) are not affected by the law, nor are public agencies, such as a school systems or correctional institutions. In addition, there are exemptions in EPPA for some commercial businesses as follows:

•    Companies under contract with the federal government
•    Companies which manufacturer, distribute or dispense controlled substances
•    Armored Car or Alarm and Security Companies
•    Nuclear or Electrical Power Plants
•    Public Water Works
•    Toxic Waste Disposal

All other commercial companies and businesses can request a current employee to take a polygraph examination or suggest to such a person that a polygraph examination be taken, only when specific conditions have been satisfied. However, the employer cannot require current employees to take an examination, and if an employee refuses a request or suggestion, the employer cannot discipline or discharge the employee based on the refusal to submit to the examination.

In general, businesses cannot request, suggest or require any job applicant to take a pre-employment polygraph examination. Secondly, businesses can request a current employee to take a polygraph examination or suggest to such a person that a polygraph examination be taken, only when specific conditions have been satisfied. However, the employer cannot require current employees to take an examination, and if an employee refuses a request or suggestion, the employer cannot discipline or discharge the employee based on the refusal to submit to the examination.

Truth Lab Polygraph Services is furnishing the following information, which is in good faith, and conforms to the Department of Labor's Regulations relating to polygraph tests for employees. This information is considered only as a guideline to assist in complying with the Act and Regulations, and Truth Lab is disclaiming any liability in connection therewith.

Employers should develop their own forms, using their own company name, and should also review their final forms with their own legal counsel.