This type of surveillance (done on foot, vehicle, or even aircraft) could have possibly scared the traitor and discourage him from undertaking an illegal act which correlated to espionage and could also have aided them to catch him in the act of committing the crime (espionage).Define personnel security within the tenets of defensive counterintelligence. How can we define personnel security with the view of defensive counterintelligence; in defensive counterintelligence, the term personnel security is referred No person shall be deemed to be eligible for access to classified information unless such access is clearly consistent with the interests of national security as provided for in reference (DoDPSP. DODD-5200.2")A determination of eligibility for access to classified information or assignment to sensitive duties is a discretionary security decision based on judgments by appropriately trained adjudicative personnel (DoDPSP. DODD-5200.2").An investigation on the personnel security is used to scrutinize and find out a person’s loyalty, character/morale’s, discretion, integrity. Some of the worst betrayals in the recent past have been financially motivated like in the case of Robert Hansen and Aldrich Ames thus financial records should be checked for irregularities ((Tayyub).