One of the least publicized, but most important tasks, for ground search teams like Halifax Search and Rescue are evidence searches. These can only be requested by Policy Authority.
Unlike the usual and far more frequent searches for human subjects, which certainly are time sensitive, the request for evidence searches can come as soon as hours or even years after an “event”.
Almost always the searchers are looking for an object rather than a human subject. That object is almost always related to a known or suspected crime. In the case of humans, the evidence search could occur years after the event and usually happens after a tip or new evidence has been provided.