When marijuana is legal in Canada, Americans are expected to flock. But the border, and US law, stands in the way.

The Ambassador Bridge, which connects Windsor, Canada, and Detroit. In October, recreational marijuana will become legal in Canada, presenting a challenge for U.S. officials at the border, where possession of the drug violates federal law. (Brittany Greeson/The Washington Post)

Recreational marijuana has been legal here in Washington state since 2014. Adults just a few miles away in Canada also will be able to legally buy and smoke marijuana for pleasure starting in October.

But between them stands the U.S. border, a

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