In my area I don't think the local SAR have found anyone alive in years. Either they turn up themselves, or they turn up dead. But I bet that they have kick as safety briefings, training sessions, and paternalistic "we know what we are doing better than you civilians" crap.
Basically what I see with drones is not a few remote controlled toys with a camera but a flock of fast flying drones that are given hints as to where to look and fly at some optimal level over the trees looking for things that are interesting. Then slower quad copter drones then fly in to take a look at the interesting things such as deer, bears, and whatnot. Then if someone is found they are identified as either the lost person or a searcher. If the lost person is found, a heavy quad copter could fly in with some quick and dirty supplies including comm. Then the humans would go straight to the person, not only using an efficient route but one that was mapped out by the drones.
Keep in mind that a drone can use a nice combination of humans back at the base combines with cool sensors. They can look for colors that don't belong in the forest, the smell of sweat (a Vietnam war technology), infra red, things that look like people, etc. Then these images can be relayed back to base for verification. (Nope that is a sleeping bobcat, not a lost child).
If anything a bunch of humans tramping about might slow the drones down.