Which of the following is an example of indirect search tactics?

Indirect search tactics refer to methods that do not involve searching the immediate area where a missing person might be located but rather focus on areas or strategies that could lead to finding the person based on logical deductions about their possible movements.

Posting searchers at likely exit points from the search area is a prime example of this concept. When searchers are stationed at these points, they are positioned to intercept someone who might be trying to leave the area, which is based on the assumption that a lost person will instinctively seek to find their way back to familiar terrain or seek assistance. This strategy relies on deductions of potential behaviors rather than direct searching of the surrounding terrain.

In contrast, the other options represent direct search tactics. For instance, using GPS systems and drones to gather information or conduct aerial surveillance are direct observations, while physical grid searches involve methodically searching an area for the target, all of which entail a hands-on approach that directly investigates the search area rather than focusing on exit strategies.