The Polygraph (Lie Detector) is a scientific instrument capable of simultaneously recording changes in several physiological variables while the subject is asked a series of questions pertaining to a specific issue under investigation. The charts generated during the polygraph examination are interpreted by a polygraph examiner.

Results are derived from the following traditional physiological parameters:

• Pneumo - Respiration (Two Channels)
• EDA - Electrodermal Activity (One Channel)
• Cardio - Blood Volume/Pulse Rate (One Channel)

If necessary, additional parameters can be recorded:

• Plethysmograph, 76604US, to measure finger pulse and blood volume
• Activity Sensor Pad, 76878US, to detect any movement by the subject
• Activity Sensor Arm Pads, 76878AS, to detect movements of shoulders, forearms, and hands
• Activity Sensor Feet Pads, 76878FS, to detect movements of feet and toes
• Countermeasure Detection System, 76876US, to detect physical and mental countermeasures
• USB Fingerprint Recording Device, LXFPRINT-U, for identification purposes
• USB Webcam with Focus and Microphone, LX-WEBCAM, to record a polygraph session

Polygraph charts are recorded in much the same manner as conventional polygraph equipment with a smooth scrolling display moving from right to left. The tracings recorded are in real-time and are truly rectilinear, so polygraph charts can be easily interpreted. The system can be operated using a mouse/pointing device or the keyboard.

Polygraph Components and Accessories

Data Acquisition System (DAS) Interface
Model LX4000
The Data Acquisition System, model LX4000, serves as an interface between the computer and polygraph accessories that register a subject's physiological parameters during a polygraph examination. The Data Acquisition System is the main component of the Basic Polygraph System, model LX4000-SW.

Vital Parts Kit with 76640DP
Model 76713DLXDP
This Vital Parts Kit is for polygraph examiners using the stainless steel EDA Finger Electrode Set, model 76640DP. The kit includes the following components: EDA Finger Electrode Set with 1/4" plug, model 76640DP, Quick Connect/Disconnect O-Ring Bits Kit, model 76748O, Pneumo Chest Assembly (gold), model 76513-1G, Pneumo Chest Assembly (bronze), model 76513-2B, Standard Kovacic Arm Cuff, model 76530, and Pump Bulb with Gauge, model 76506LX. This kit is for model LX4000-SW and model LX3000-SW. Note: Currently the majority of Ukrainian polygraph examiners prefer using stainless steel EDA Finger Electrode, thus this is the correct Vital Parts Kit for their Lafayette computerized polygraphs.

Vital Parts Kit with 76640SO
Model 76713DLXSO
This Vital Parts Kit is for polygraph examiners using the EDA Disposable Finger Electrode Set, model 76640SO. The kit includes: EDA Electrode Cable with 1 package of 100 Disposable Electrodes, model 76640SO, 1 additional package of 100 Disposable Electrodes, model 76642D, Quick Connect/Disconnect O-Ring Bits Kit, model 76748O, Pneumo Chest Assembly (gold), model 76513-1G, Pneumo Chest Assembly (bronze), model 76513-2B, Standard Kovacic Arm Cuff, model 76530, and Pump Bulb with Gauge, model 76506LX. This kit is for both Lafayette Instrument Company computerized polygraphs model LX4000-SW and model LX3000-SW.

Plethysmograph
Model 76604US
The Plethysmograph, model 76604US, uses an infrared photoelectric finger sensor, which registers changes in blood flow from the finger. It functions by recording the changes of finger blood volume as the arterial pulse expands and contracts the microvasculature. It is designed for use with Lafayette Instrument Company computerized polygraphs. The Plethysmograph produces high quality tracings. It is cushioned with soft rubber padding for added comfort and for reduction of movement artifact. The Plethysmograph is small, light, and has a small diameter and flexible cable.

Pneumo Chest Assembly (Gold)
Model 76513-1G
Only the finest quality materials are used for this Pneumo, which is 0.75" in diameter, 13" extended and 8" relaxed. There is a 46" beaded chain and 7' of rubber tubing. The gold designation given above refers to the quick connect/disconnects which are fitted to the tubing for easy application and removal of hoses. A 45" Pneumo Beaded Chain Extender, model 76513BC, may also be purchased.

Pneumo Chest Assembly (Bronze)
Model 76513-2B
Only the finest quality materials are used for this Pneumo, which is 0.75" in diameter, 13" extended and 8" relaxed. There is a 46" beaded chain and 7' of rubber tubing. The bronze designation given above refers to the quick connect/disconnects which are fitted to the tubing for easy application and removal of hoses. A 45" Pneumo Beaded Chain Extender, model 76513BC, may also be purchased.

EDA Finger Electrode Set
Model 76640DP
The Lafayette Finger Electrode Set has been designed for maximum efficiency and serviceability. On one end the 1/4" plug connects the EDA Finger Electrode Set to the Data Acquisition System (DAS) Interface, model LX4000. The opposite end of the cable is bifurcated into two cable branches both ending with a simple pin jack. The two pin jacks connect to the two finger plates, which are then placed on the subject's index and ring fingers of the right hand during a polygraph examination. The finger plates are made of stainless steel and are fitted with Velcro tape.

EDA Cable with Snap Reusable Electrodes
Model 76640SP
The Lafayette EDA Cable with Snap Reusable Electrodes has been designed for maximum efficiency and serviceability. On one end the 1/4" plug connects the model 76640SP to the Data Acquisition System (DAS) Interface, model LX4000. The opposite end of the cable (model 76643SO) is bifurcated into two cable branches both ending with a snap connector. The two snap connectors snap to the two finger plates, which are then placed on the subject's index and ring fingers of the right hand during a polygraph examination. The finger plates are made of stainless steel and are fitted with Velcro tape. No other company in the world manufactures stainless steel electrodes with snaps.

EDA Electrode Cable
Model 76643SO
Generally, the EDA Electrode Cable, model 76643SO, is supplied with the Lafayette EDA Cable with Snap Reusable Electrodes, model 76640SP, and the Disposable EDA Electrodes, model 76640SO. It can be purchased separately as well. On one end the 1/4" plug of the model 76643SO connects to the Data Acquisition System (DAS) Interface, model LX4000. The opposite end of the cable is bifurcated into two cable branches both ending with a snap connector. The two snap connectors snap to either the two stainless steel EDA finger plates or the two Ag/AgCl EDA disposable snap electrodes, depending on the EDA electrode used by the polygraph examiner.

Disposable EDA Electrodes
Model 76640SO
This kit for measuring skin conductance includes a package of 100 Ag/AgCl EDA (Electrodermal Activity) disposable snap electrodes (sensors) and an electrode cable, model 76643SO , one end of which bifurcates into two cables each ending with snap connectors. The other end of the cable connects to the DAS Interface through a 1/4" plug. The electrodes are pre-gelled, hypoallergenic and latex free. The electrodes are easy to use - simply peel off strip and place on fingers. These electrodes are less susceptible to movement artifacts and lower resistance between subject and electrode giving more accurate signals. The electrodes are normally placed on the palm of the right hand. If required, they can be placed on foot bottoms or armpits.

Disposable EDA Electrodes
Model 76642D
The model 76642D consists of a package of 100 Ag/AgCl EDA (Electrodermal Activity) disposable snap electrodes (sensors) for measuring skin conductance of subjects undergoing polygraph examination. Two of these electrodes snap to the two snap connectors of the electrode cable, model 76643SO. The 76642D EDA electrodes are pre-gelled, hypoallergenic, and latex free. The electrodes are easy to use - simply peel off strip and place on fingers. These disposable electrodes are less susceptible to movement artifacts and lower resistance between subject and electrode giving more accurate signals. The electrodes are normally placed on the palm of the right hand. If required, they can be placed on foot bottoms or armpits.

Electrode Gel
Model 76623G
This is multi-purpose Ag/AgCl electrode conductivity gel. It is highly conductive, chloride free and hypoallergenic. Its non-thinning formula will not irritate and will resist breakdown from body heat and salts in perspiration and will remain moist, thick and uniformly conductive throughout the most prolonged polygraph examination. This gel reduces the electrode-impedance and optimizes the contact between the skin and the electrode thus leading to better quality parameter tracings. This electrode gel can be used with the three models (stainless steel and disposable) of EDA Electrodes offered by Lafayette Instrument Company. Unit size: 90 ml

Kovacic Arm Cuff, 23-35 cm (Standard)
Model 76530
Lafayette Instrument Company patented standard blood pressure Kovacic style cuff for Lafayette Instrument Company computerized polygraphs eliminates problems associated with a loosely wrapped cuff and ensures that the cuff does not shift away from the brachial artery during application. The unique Velcro tab and cuff aperture technique provides a tight "double wrap". The cuff connects to the Data Acquisition System (DAS) Interface, model LX4000.

Rakes Deluxe Forearm Cuff
Model 76531BR
Rakes Deluxe Forearm Cuff consists of two components: a forearm cuff and a metal stand. During a polygraph examination the metal stand is placed upon the polygraph chair arm and the subject's forearm (with the cuff on) rests upon it. The metal stand has an indentation which accepts the forearm cuff. This design allows for the elimination or reduction of pressure naturally applied on the cuff by the arm's weight, and prevents the restriction of blood flow. The Rakes cuff ensures the utmost accuracy of the polygraph examination. It is more comfortable and stable than the Kovacic Arm Cuff.

Golden Universal Accu-Cuff
Model 76530AC
The Golden Universal Accu-Cuff, model 76530AC, is designed to measure the arterial blood pressure of an examinee during a polygraph examination. The cuff connects to the Data Acquisition System (DAS) Interface, model LX4000. The Golden Universal Accu-Cuff fits a large variety of arm sizes, from smallest to largest. This cuff has a metal clip, which makes it more adjustable, easier to fit, and more user friendly than the Standard Kovacic Arm Cuff, model 76530.

Additional Cuffs
Models 76531, 76532, 76534
Depending upon the nature of the situation, three additional cuffs can be utilized for measuring the arterial blood pressure of an examinee during a polygraph examination: 1) Kovacic Forearm Cuff (18-26 cm), model 76531, 2) Kovacic Wrist Cuff (10-14 cm), model 76532 and 3) Kovacic Large Arm Cuff (33-47 cm), model 76534. The design of these cuffs is identical to that of the Standard Kovacic Arm Cuff, and they differ just in size. The Large Arm Cuff, for example, should to be used when testing subjects with a large upper arm. This cuff is also placed on legs of armless disabled individuals. When examining small-size individuals, for instance Japanese, the Forearm Cuff is used instead of the Standard Kovacic Arm Cuff.

Finger Cuff
Model 76535
This lightweight and portable polygraph finger cuff was designed to improve the examinee’s comfort during a polygraph examination by creating less pressure. The cuff can be used as an alternative to the standard arm cuff, such as the Kovacic Arm Cuff, for measuring arterial blood pressure. The finger cuff produces high quality, highly stable tracings. Unlike the standard arm cuff (primarily wrapped around a left arm), this easy-to-wear and easy-to-use cuff can be wrapped around any finger of any hand. Also, unlike the standard arm cuff, the 76535 does not need to be taken off between charts to allow the subject’s arm to rest. The cuff is made of the same high quality material as LIC’s standard arm cuff. It is used with the LX4000-SW computerized polygraph.

Pump Bulb Assembly
Model 76506LX
The Pump Bulb Assembly is a high quality sphygmomanometer assembly for Lafayette Instrument Company computerized polygraphs, which for the purpose of convenient or comfortable measuring integrates into a single mechanism the following components: a pump bulb with bleed valve, plastic locking pinch clip, rubber tubing and a bronze quick connect, which connects the assembly to the Data Acquisition System (DAS) Interface of the polygraph, model LX4000. Pressure range: 0-300 mmHg.

Countermeasure Detection System
Model 76876US
The Lafayette Instrument Company 76876US Microphone Voice Countermeasure is used with the LX4000-SW Computerized Polygraph to detect mental countermeasures used by a subject during examination. The LXSoftware is used to capture waveforms produced by both the subject and examiner. These waveforms are then analyzed by the software to help determine the subjects' polygraph results.

Activity Sensor Pad
Model 76878US
The Activity Sensor is an accessory to Lafayette Instrument Company computerized polygraphs. It is designed to detect subtle movements, as well as gross movements, of a subject during a polygraph examination. By providing a graphic record of subject movement, the Activity Sensor allows the polygraph examiner to concentrate on administering the exam instead of trying to observe the subject's movement. The Activity Sensor is designed to detect movements through Piezo sensors mounted in a silicone mold. The sensor pouch is located on the seat of the polygraph chair (as shown in the photo) under the subject. As the subject moves, pressure changes are detected from the pouch. The Activity Sensor is constructed with multiple Piezo sensors to detect movement over the entire area of the seat. This unit provides automatic zeroing of the measurement range independent of the subject's weight. It also eliminates the "out of measurement range" problem.

Activity Sensor Arm Pads
Model 76878AS
The Activity Sensor Arm Pads' design and functionality are based on the same concept as the model 76878US. The arm pads are utilized with Lafayette Instrument Company’s computerized polygraphs and are constructed with multiple Piezo sensors mounted in a silicone mold to detect subtle, as well as gross movements of shoulders, forearms, and hands of the subject during a polygraph examination. The sensors, in pouch form, are placed on the chair arms (as shown in the photo) and the subject's arms rest upon them. By providing a graphic record of subject movement, the Activity Sensor Arm Pads allow the polygraph examiner to concentrate on administering the polygraph exam instead of trying to observe the subject's movement.

Activity Sensor Feet Pads
Model 76878FS
The Activity Sensor Feet Pads are utilized with Lafayette Instrument Company's computerized polygraphs and are constructed with multiple Piezo sensors mounted in a silicone mold to detect subtle, as well as gross movements of feet and toes of the subject during a polygraph examination. The sensors are placed on the floor and the examinee's feet set upon them. By providing a graphic record of subject movement, the Activity Sensor Feet Pads allow the polygraph examiner to concentrate on administering the polygraph exam instead of trying to observe the subject's movement.

USB Fingerprint Recording Device
Model LXFPRINT-U
The USB Fingerprint Recording Device allows recording fingerprints of both polygraph examiners and subjects for identification purposes. This device functions with personal computers, laptops and notebooks. The utilization of the fingerprint reader LXFPRINT-U eliminates the need for passwords by a polygraph examiner. It also allows the polygraph examiner to attach the subject's fingerprint to his file and print it on a polygraph examination report. This could be a great resource in a court of law.

USB Webcam with Focus and Microphone
Model LX-WEBCAM
LX Operating Software allows a polygraph examiner to record (with sound) a polygraph session on a computer screen using an inexpensive digital camera (QuickCam Pro 4000 Logitech). Video recording is synchronized with a polygraph chart and the recording can be played back. The video-recording feature is helpful in polygraph analysis and protects the polygraph examiner from possible false accusations by clients. Polygraph sessions can be recorded on CDs and/or DVDs after a test depending upon the computer's capabilities. CD-ROM required and CD-RW or DVD-RW recommended for new systems. Record the entire test from the subject's arrival to departure, or just use as a monitor during testing.

Bits Kit for Quick Connect/Disconnect Attachments
Model 76748O
This Bits Kit for Quick Connect/Disconnect Attachments provides 20 spare rubber o-rings for connectors located on the back of the Data Acquisition System Interface, model LX4000.  O-rings eliminate air leakage from the computerized polygraph by maintaining a tight connection.  When o-rings wear out, they should be replaced using the silver cone-shaped device shown in the photo.  Simply place the large end of silver cone onto the connector and place the replacement o-ring on the small end of the silver cone and roll into place.

Calibrator for Computerized Systems
Model 76740LX
This stand-alone calibrator is a precision instrument designed to test the operating efficiency of all makes and brands of conventional and computerized polygraphs, including the computerized polygraph LX4000-SW. This calibrator is capable of checking the pneumo, cardio and EDA/GSR components against factory standards. Lafayette Instrument Company recommends performing functionality checks at a minimum of once every six months, if the polygraph examiner suspects a functionality problem or if the date of the last functionality test in not known.

Adjustable-Arm Subject's Chair (Vinyl)
Model 76871V
The subject's chair is built to orthopedic standards to ensure proper posture and back support. T-frame legs provide maximum stability while adjustable armrests are a one-piece design making this section solid, requiring less hardware. The height of chair arms is easily adjusted depending on the height and size of the examinee. Thanks to the optimal chair design, the arm cuff placed around the subject's arm does not touch her body, which maximizes the obtainment of an objective polygraph examination result. The chair comes with all the tools that are required and is easily assembled in a matter of minutes. Shipping weight: 115 lbs.

Adjustable-Arm Subject's Chair (Cloth)
Model 76871
The subject's chair is built to orthopedic standards to ensure proper posture and back support. T-frame legs provide maximum stability while adjustable armrests are a one-piece design making this section solid, requiring less hardware. The chair is constructed in durable grey Herculon® fabric with black vinyl trim. We offer arm chair covers that are removable and washable. The height of chair arms is easily adjusted depending on the height and size of the examinee. Thanks to the optimal chair design, the arm cuff placed around the subject's arm does not touch her body, which maximizes the obtainment of an objective polygraph examination result. The chair comes with all the tools that are required and is easily assembled in a matter of minutes. Shipping weight: 115 lbs.

Portable Subject's Chair
Model 76877
This chair is especially useful for the examiner whose profession takes him into many unknown field testing situations. This new folding chair design is more durable and easier to transport than the old 76872 portable subject's chair and is rated at a higher weight capacity. The height and angle of chair arms are easily adjusted depending on the height and size of the examinee. Thanks to the optimal chair design, the arm cuff placed around the subject's arm does not touch his or her body, which maximizes the obtainment of an objective polygraph examination result. The chair folds easily, will fit in a vehicle for transport and weighs only 18.5 lbs.

Portable Carrying Case
Model LX-1050
The Deluxe 17" Leather Notebook Case brings together the most popular features of our original Leather Notebook Case and a more spacious design able to accommodate larger screen notebooks. The removable mesh accessory pouch and divided, expandable file section provide added functionality and storage space while the nyflex-lined computer compartment protects your investment. The workstation includes pockets for a PDA, pens, business cards and other mobile necessities. Color: Black. Interior Dimensions: 16.5" x 2.2" x 12.9". Exterior Dimensions: 17.5" x 6.5" x 13.5". Exterior Material: Genuine Leather. Weight: 5.1 lbs. Picture courtesy of Targus, Inc. All rights reserved.

Carrying Case with Wheels
Model LX-1055
The new Targus XL Rolling Notebook Case combines the features of the XL Notebook Case with rolling capabilities for travel ease. With its 36" telescoping handle, "in-line skate" wheels, air cushion protection system and ample storage space, this rolling notebook case is the easiest way to transport all of your mobile computing essentials. The removable accessory pouches allow for maximum versatility. Color: Black. Exterior Dimensions: 19" x 8.5" x 16". Interior Dimensions: 16.5" x 2.2" x 12.9". Exterior Material: 840D Nylon. Weight: 8 lbs. Picture courtesy of Targus, Inc. All rights reserved.

Portable Thermal Printer
Model LX-1575*C
At barely over 10" (26 cm) long and 1 lb. (0.45 kg) in weight, including the battery, the Pentax PocketJet II fits easily into your briefcase, computer bag, or can be quickly mounted in any vehicle or small work area. Using advanced Direct Thermal Printing Technology, the Pentax PocketJet II eliminates the need for messy and expensive ink, toner, or ribbons. The printer uses roll thermal paper, model LX-1575TCP, to print laser-quality reports and continuous real-time charts. The optional paper stand, model LX-1575STD, is recommended. Dimensions: 5.5 x 26.4 x 3.0 cm.

Paper Holder for Pentax Printer
Model LX-1575STD
This optional small paper stand is strongly recommended for use with the Pentax PocketJet II, model LX-1575*C. It holds both roll thermal paper, model LX-1575TCP and the Pentax PocketJet II printer. The Paper Stand, model LX-1575STD, is manufactured by Lafayette Instrument Company. For housing bigger size roll thermal paper we offer the Large Paper Holder for Pentax Printer, model LX-1575LRG.

Polygraph Scoring Algorithms

POLYSCORE® Polygraph Software
Model POLYUPGRD
The latest version of POLYSCORE® is now Windows®-based for ease of use. It allows you the ability to view and print stacked charts. Another feature that examiners will find valuable is the on-screen color-coded bar graph display. This feature makes it very easy to graphically display reaction strengths, allowing for easy public/novice interpretation. Additionally, by upgrading to this version of POLYSCORE®, current LX users will now be able to fully utilize all of its previously unavailable features. POLYSCORE is designed by the Applied Physics Laboratory at Johns Hopkins University.

QuESt Polygraph Software
Model LXQUEST
Quantitative Evaluation System (QuESt) allows the examiner to analyze charts without the computer making an interpretation of truth or deception. QuESt graphically displays relative reaction strengths with color-coded bar graph or hodograph. It will analyze any question format, and offers selectable analysis times. Individual standardized charts may be viewed in a variety of time continuums, allowing the examiner a more detailed analysis or a global view. This computerized polygraph analysis software was designed by polygraph examiners for polygraph examiners.

Identifi Polygraph Software
Model IDENTIFI
Computerized polygraph analysis software, Identifi, is now available for the first time to Lafayette users. It scores charts utilizing a three-position or seven-position scale. An examiner may choose to analyze relevant questions against weaker adjacent or preceding comparison questions. This algorithm will score many different examination types, including screening tests such as pre-employment and security examinations. Identifi allows the examiner the ability to choose either automated auto-numerical scoring or examiner scoring.

ASIT Computer Scoring Software
Model LXASIT
Lafayette Instrument Company has worked with the Academy for Scientific Investigative Training (ASIT), directed by Nathan Gordon, to tightly integrate the ASIT computerized scoring algorithm with the LXSoftware. Using the LXSoftware, sensor line length and magnitude measurements can be easily made using the LXSoftware's chart review calipers. These measurements are transmitted automatically and transparently to the ASIT scoring algorithm, greatly simplifying computerized scoring using the ASIT algorithm. The ASIT computerized scoring algorithm is sold separately from LXSoftware.

Objective Scoring System (OSS)
Model OSS
OSS is a manual numerical scoring method developed for evidentiary applications. It allows virtually perfect agreement among multiple scorers and it is possible to estimate accuracy from these scores. While the OSS uses far fewer criteria for evaluating data than other systems, it requires scrupulous attention to the scoring protocol to deliver these advantages over traditional 7-position scoring. Not only is this second opinion important, but having an empirical foundation for the analyses that support your conclusion would go a long way toward your credibility in court.

Warranty Policy

Lafayette Instrument Company (LIC) guarantees their DAS, model LX4000, against all defects in materials and workmanship to the original purchaser for a period of three (3) years and all polygraph accessories for a period of one (1) year from the date of shipment, unless otherwise stated. During this period, LIC will repair or replace, at its option, any equipment found to be defective in materials or workmanship. If a problem arises, please contact our office for prior authorization before returning the item. This warranty does not extend to damaged equipment resulting from alteration, misuse, negligence or abuse, normal wear or accident. In no event shall LIC be liable for incidental or consequential damages. Warranty period for repairs or used LIC equipment purchased from ARGO-A is 90 days.

Export License

The U.S. Department of Commerce requires an export license for any polygraph system shipment to Ukraine, Moldova, Belarus, Georgia, and Azerbaijan. It is against U.S. law to ship a polygraph system to these countries without an export license. Contact us for the required license application form. This is a simple and standard procedure, and we will be happy to assist you in completing the forms. ARGO-A and LIC will take care of the rest.