Originally Posted by
Ripper3785
One would think that there would be a logical way to find someone, but this is the TSA we're talking about.
I would think if they are looking for someone they don't want to alert them, but would rather 'surprise' them at exit. If there really was a threat of some sort and they boarded, it's an immediate alert and a chance for the suspect to take drastic action like grabbing someone's kid or something.