Looks they are already scaling back the search.

As the search for a missing Whitby, Ont., high-school teacher entered its fourth day, police are widening the geographical area before planning to scale back their efforts later Thursday.

Jeffrey Boucher, a 52-year-old father of two, mysteriously disappeared after he is believed to have gone for an early-morning jog on Monday.

Despite an extensive search, no trace of Mr. Boucher has been found and police have been unable to confirm that he did, in fact, leave his home for a run around 6 a.m. as his family says was his usual routine.

“We are hoping that he has perhaps walked away for his own reasons or has for whatever reason stepped away from his usual routines of work and family,” said Sergeant Nancy van Rooy of Durham Regional Police. “For that reason, if he himself is listening or others that do know his whereabouts: Family, friends, the public, media, everyone’s concerned for him. We’d like to have closure here.”
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock