ABSTRACT - Ward Elcock, director of Canadian Security Intelligence Service, explains reasoning behind Canada's less invasive approach to terror prevention; says rather than detain or arrest suspects at first blush, Canadian spies watch them, periodically interview them and share intelligence they gather with United States; some experts fear that unknown numbers of Qaeda operatives in Canada may simply have eluded authorities (M) In this increasingly diverse society, Mohammed Mansur Jabarah appeared typical -- just another teenager from an immigrant family.

The son of a Kuwaiti stockbroker, he grew up an eager soccer fan in St. Catharines, a quiet town outside Toronto known for its vineyards and panoramic views of Lake Ontario.

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