I don&#x27;t agree with your assertion.<p>Background checks ( of the TSA&#x27;s depth ) don&#x27;t reveal if a candidate is susceptible to blackmail or coercion, so physical checks are always a good idea.<p>After all it&#x27;s not who you are but what you possess that constitutes a threat.<p>So what is the point of pre-&quot;clearance&quot;?  Revenue, I suspect.