ArriveCan must be used by all runners crossing border for Detroit marathon

Thousands race across the border in the Detroit Free Press Marathon in Windsor, Ont., on Sunday, Oct.15, 2017. (Melanie Borrelli / CTV Windsor) Thousands race across the border in the Detroit Free Press Marathon in Windsor, Ont., on Sunday, Oct.15, 2017. (Melanie Borrelli / CTV Windsor)

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