LVA 6.50™

Professional Investigation Focus Tool

Capable of detecting and measuring many different psychophysiological reactions that are indicative of changes in the tested party's perception, alerting the trained operator to follow its indication and leads.
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Get to know Your Suspects. Fast.

Using the combined skills of your professional knowledge and the high sensing capabilities of LVA, the system will lead you to reveal the whole truth much faster than ever before.

Real Time Analysis

Real-time analysis during investigations Face to Face / Over-The-Phone.

Post Analysis

In-depth analysis of pre-recorded materialIn-depth analysis of pre-recorded material.

The Friendly & Intuitive Investigation Tool of Choice

Easy to Learn

Easy to Operate

Analyses Free Speech

Language Independent

Interactive Analysis Displays

Assess the speaker's intentions and veracity, get valuable insights about their concerns and strengths

Undercover Work

The ability to perform full analysis over the phone offers new possibilities

Sensitive Position Recruitment

Reveal new layers of information that would normally not be accessible


Direct the investigation into the relevant path, identify new leads and sensitive points, and reveal the truth

LVA 6.50™ is the Tool of Choice for Almost any Investigation Need

Unlike other systems of its kind, LVA 6.50™ analyses free and natural speech, and in fact prefers to “listen to the thought process” as it gives the LVA more voice data and helps to understand the thinking mood of the suspect – things that cannot be identified from a simple “yes/no” response. This feature makes it suitable also for undercover work analysis, when the analysis is conducted (where applicable by law) without the subject’s knowledge or preparation.

LVA Technology

LVA Technology enables a quick and effective decision-making process based on any available speech data. It identifies various types of stress, cognitive processes and emotional reactions that expose the emotional profile and sensitive discussion points of your subject.
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LVA 6.50™ and the Polygraph, Friends or Foes?

Is LVA 6.50™ a substitute for the polygraph? We say no. The polygraph has been around for over 100 years, and when used properly it is a very effective tool. We have several polygraph experts in our network, and we can say clearly where each of the products can complement the other, all with the aim to get the truth. 

LVA 6.50™ Completes (not competes) with the Polygraph

Use LVA earlier in the investigation when you may have a large number of suspects and little time. LVA 6.50™ is used in the pre-test interview (before the polygraph test), and can hint to prepare a better Polygraph questionnaire. LVA 6.50™ works over the phone and with recorded material. Use LVA when you don't want the suspect to know. Better with open conversations than "yes/no" questions.

Suitable for all Organisations & Sizes

LVA is a scalable system available in different configurations, designed to support any size and type of investigative organisation: From SMEs to multi-national enterprises, special units to armed forces and law enforcement. Deployed from remote single stand alone terminal to multi-sites with on premise server based solutions.
  • Armed Forces
  • Police and special units
  • Guards and private security firms
  • Government Security
  • Network chains
  • Corporate Security
  • Banks
  • Hotels
  • Insurance Firms

Frequently Asked Questions

What exactly is LVA 6.50?

LVA 6.50 is a set of tools designed to help investigators focus on relevant issues throughout the course of an investigation. LVA 6.50 has 2 analysis modes, each designed for a very specific use. The Online mode enables you to adjust your investigation while you are speaking with your subject. LVA 6.50 indications will provide you with important information regarding your subject’s state-of-mind during every moment of the conversation, and will indicate in real-time your subject’s honesty level. The Offline mode is designed for in-depth analysis of recorded material, mostly for “semi-Intelligence” gathering. The Offline mode allows you to compare different portions of the conversation, find repeating indications, understand how your subject feels about other people/objects in the story and find what troubles your subject the most.

Does LVA 6.50 use “micro tremor” analysis (like CVSA or VSA)?

No. Micro tremors used by other voice stress analyzers, focus on the 8-14 Hz range. These tools are designed only to detect “stress”. The range of frequencies measured for micro tremor analysis makes it unusable for phone conversation analysis because phone lines (and most microphones) limit the frequency range to a minimum of 200Hz (above the analyzed portion for micro tremors). LVA 6.50, on the other hand, does a full-spectrum comparison, looking at the “small details” all around the spectrum. LVA 6.50, therefore, can detect not only stress, but other states of mind and emotional reactions.

Is LVA 6.50 language dependent?

No. You can use LVA 6.50 with speakers of any language with no need for special adjustments. However, to avoid incorrect indications and limit “white-noise”, it is highly recommended that your subject speaks in his native language or in the language that he can actually “think” in.

How accurate is LVA 6.50?

The LVA accuracy is dependent upon several factors:
The emotional involvement and jeopardy of the tested party with regards to what is being analyzed. Jokes and lies of minimal involvement will produce very limited emotional activity.
The quality of the input and signal to noise ratio. High noise levels - or too low or too high input volumes (beyond the sound card’s ability to record) will produce inaccurate or erroneous results.
Proper operation of the system. LVA 6.50 is a semi-automatic system. Calibration quality in the online modes and proper preparation of the subject to the test, all have an effect on the results (technological measures are taken to prevent most of these issues).
The test settings and possible uncontrolled interferences or environmental distractions.
“Borderline” personality issues or clinical conditions of the tested party may cause strange or inaccurate results.
Essentially, if the quality of the voice is reasonably good and the operation and preparation is proper, the emotional analysis component will be almost 100% accurate. In this case, the technology will properly present how the tested subject is feeling in terms of emotional charge, cognitive conflicts and general stress (“Fight or Flight” syndrome). If the intention to deceive is genuine and possesses jeopardy on the tested subject, (assuming the tested party falls within the standard range of “sanity” or “normality”), then the inaccuracy and High-Risk (lie level determination) will also be accurate more than 90% of the time. (In the latest field research study conducted on 496 passengers in an airport, LVA was able to render an overall accurate analysis in all 496 cases.)

Who should be using LVA 6.50?

LVA 6.50 is designed for professional investigators who received proper training from Nemesysco’s certified trainers. The ideal user will have a background in Psychology, and/or knowledge in how to conduct investigations.

What is the underlying principle of the LVA system?

Speech is a highly complex mechanism, the components of which are controlled by the Cerebral Cortex. Many physiological processes must work in perfect synchronization to produce appropriate speech flow. The brain supervises and monitors this process closely. Therefore, any “event” which occurs in the brain at any time (heightened activity, delayed activity, internal conflict) will be reflected in the vocal waveform during speech. In addition, any changes in perception and/or interpretation of a given context will also manifest in the voice.

Is LVA 6.50 analysis a “Black-Box”?

Not really. Once you understand the basic principle, the analysis process becomes simple to understand. However, many of the parameters and algorithms used during analysis are in fact confidential and are considered to be the Secret Know-How of Nemesysco.

Should I stop using my Polygraph?

We don’t think so. The Polygraph has a very long history, and is known to be very effective when used by professionals in the way it was intended. LVA 6.50 is NOT a Polygraph. We recommend using LVA 6.50 at the beginning of the investigation process (during the pre-test interview) or even before submitting any subject to the Polygraph test, to limit the scope of the investigation for relevant issues and subjects, and to use the polygraph for the examination and final verification.

Can you explain all the information generated by LVA 6.50?

Our voice analysis technology has been around since 1997, and we are constantly learning more. Behavioral patterns, new parameters and questioning techniques are developed daily, and are automatically incorporated in our upgraded versions.

In what other languages is LVA 6.50 available?

LVA 6.50 can be localised to any language. Currently, the languages available for the LVA 6.50 are: English, Chinese, Spanish, Portuguese, Russian, Hungarian and many more.
Behavioural Cues LVA – Powered by Nemesysco

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