liebeater,

You asked:

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I want to ask something can polygraph used only to detect responses only from suspected persons to know if the person has direct relation to specific action,not in the formal form but in the truth seeking only about sensitive information related to classified information with reasonable confirmation?

The short answer to your question is "no." Unless the person being "tested" makes a confession or admission, polygraph testing provides reasonable confirmation of...nothing.

This notwithstanding, the United States government uses polygraphs for purposes of seeking the truth about sensitive information on a routine basis. U.S. intelligence services, for example, use the polygraph in an attempt to determine whether intelligence sources (spies) who provide information to the U.S. are actually double agents. This use of the polygraph is referred to as "Operational Source Testing" by the U.S. polygraph community. The following is a brief description of the Department of Defense Polygraph Institute's Operational Source Testing course, taken from the DoDPI website:

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8. OPERATIONAL SOURCE TESTING 01-1Ê7 -11 MAY 01 (32 CEH) Although originally designed specifically to enhance the abilities of the intelligence and counterintelligence examiners who are or were being assigned to PDD duties in support of HUMINT and OFCO operations, this course has now broadened to provide topics of interest to the federal law enforcement polygraph examiner. The course includes background information on operational terminology, briefings on the operational structure and function of various intelligence agencies within the federal government. Also included are instructional segments concerning legal issues, use of interpreters, Foreign Intelligence Service recruitment operations and Domestic and International Terrorism. Instruction will also be offered in the areas of Foreign Use of Polygraph and an expanded block of instruction on the use of polygraph in source and Informant Testing. A developing topic of the course will be offered on the issue of Cultural Impacts of PDD Testing. Prerequisites: The student must be a federal PDD examiner and possess a SECRET CLEARANCE. Written verification of security clearance must be submitted to the course manager a minimum of two weeks PRIOR to the course starting date.

Although U.S. intelligence services have placed great reliance on polygraphy for screening informants/defectors, double agents working for the Soviet Union/Russia, China, Cuba, and the former East Germany have fooled U.S. polygraphers. And at least one genuine defector (from China) was wrongly determined to be a double agent based on polygraph chart readings.

You also asked:

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& can the person falsely gives no response intentally to the subject he really know, or things he really did?

When a person lies, he may or may not show physiological responses that polygraphers believe to be indicative of deception. Nonetheless, with the exception of breathing, such responses cannot be consciously controlled within the time frame of a polygraph interrogation. Electrodermal reactions, however, can be inhibited through the use of an anticholinergic drug such as scopolamine. But attempts to inhibit physiological reactions are not the ideal way to defeat a polygraph "test." Augmenting one's responses to the so-called "control" questions is more effective.

Finally, you asked:

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& how the person can psycologically give response to the  control Questions & isn't it exhausting or distract the attention from  the questions asked by the polygraphor?

You'll find a description of simple ways to augment one's physiological responses to the "control" questions in Chapter 4 of The Lie Behind the Lie Detector.