We'll probably never know if Hassan Diab, a Lebanese Canadian sociology professor, had any role in the 1980 bombing of a Paris synagogue that killed four people and injured dozens more. But he's been found guilty, in absentia, by a French court, anyway.

This is the second time France has attempted to punish Diab for his alleged role in the attack, and the evidence has been described as flimsy. The first time, he was extradited and jailed in France before charges were dropped, prompting Prime Minister Justin Trudeau to criticize the case and the extradition.

But now that a court has convicted, will France ask Canada for Diab a second time? If they do, will Canada comply? This is a case that could test the relationship between the two countries, and Canada's policy on extraditions in general.

GUEST: Leyland Cecco, reporting for The Guardian

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From a synagogue bombing in Paris, to an Ottawa classroom 40 years later