The recent meta-analytic survey being distributed in the polygraph community focuses our attention on the polygraph techniques that provide the best results. It was no surprise to learn that one of the most scientifically researched and validated methodologies available to polygraph science today, the Concealed Information Test, made the cut and is on the approved list. “In cases amenable to both the CIT and CQT, a CIT should always be conducted first. It should be the preferred method for evidentiary applications.” (Krapohl, 2011).
As the use of CIT examinations increases the professional examiner should give due consideration to polygraph software and instrumentation that maximizes the power of this effective polygraph technique. Since 2003 Limestone Technologies has offered examiners the most comprehensive CIT utilities available anywhere. Limestone’s in house software engineers have taken the time to ensure that the CIT examination technique is as easy and effective as possible.
Got EDA? CIT examinations demand a reliable and proven electro dermal measurement
In a CIT the quality of your EDA tracing is especially important since this is the tracing you will base your decision on. Some examiners will also record breathing using a respiration transducer but this is more of a countermeasure indicator than for diagnostic purposes. Limestone Technologies highly recommends recording changes in skin conductance which is the contemporary and preferred method by the scientific community for recording electro-dermal activity.
The added power and flexibility to add visual stimulus to your CIT exam
Limestone Technologies was the first and only polygraph vendor to offer examiners the ability to easily incorporate and present visual stimulus in their polygraph examination. We have provided this value added feature since 2003 and this utility is based on our background knowledge of the memory recognition style tests employed by polygraph examiners in criminal investigations. By presenting a serious of images from a crime scene examiners can record the significant reactions elicited from a guilty individual. Below are quick tips for incorporating visual stimulus using the QuestionEditor+.
Step 1: Create your question template
For your first question sequence select an element of the crime. For this example we have focused on the point of entry in a break and enter. Now we can add a number of points of entry and code the key item as Relevant and the other plausible points of entry as Neutral.
Step 2: Add images
Now we can import images of the items using the Media Options button. Click the button to the right of the question text labeled Image to browse to the location of the picture. You will need to repeat these steps for the remaining neutral items using stock photography.
Step 3: Set parameters
Next you will need to enter information related to the duration of display on a secondary monitor and whether or not the image will appear when you begin asking the question by holding down the spacebar. We recommend linking the image to the spacebar so that when you begin asking the stimulus the image is displayed for the examinee.
Step 4: Add additional sequences
A CIT increases in accuracy the more keys are added. We recommend adding 4-6 keys and this can be done by adding sequences to your question set template. Add a sequence for each of the elements of the crime scene you plan to test on.
Step 5: Save
Click the Save button in the QuestionEditor+ toolbar to save the question set so it is available when you are ready to conduct your CIT investigation.
Viewing test results using the new Relative Response Magnitude (RRM) feature
The new Relative Response Magnitude feature makes sharing examination results with individuals outside the polygraph profession straightforward and easy to visualize. This feature displays the reactions to each question or stimulus in an easy to interpret bar graph. This algorithm is available in
Polygraph Professional Suite 3.0 and can be accessed through the ChartViewer Measurement options.
For more information on Polygraph Professional Suite or any of the available features contact Limestone Technologies.