AMSTERDAM -- A policy barring foreign tourists from buying marijuana in the Netherlands went into effect in parts of the country yesterday, with attention focused on the southern city of Maastricht, where a cafe was warned over violating the ban, and around 200 smokers marched in protest.

Weed is technically illegal in the Netherlands, but it has been sold openly for decades in small amounts in designated cafes under the country's tolerance policy.

Under a government policy change, as of May 1, only holders of a "weed pass" are supposed to be allowed to purchase the drug in three southern provinces. Nonresidents aren't eligible for the pass.

The policy isn't supposed to go into effect in Amsterdam, home to around a third of the country's coffee shops, until next year -- and it may never be. The city opposes the idea and the conservative national government collapsed last week, raising questions about whether a new cabinet will persevere with the policy change after September elections.

Maastricht borders both Belgium and Germany and has suffered the effects of constant traffic from more than a million non-Dutch Europeans driving to the city annually just to purchase as much cannabis as possible and drive back home. Most shops in Maastricht plan to refuse to use the pass and kept their doors shut yesterday.

There was one exception: the "Easy Going" shop of Marc Josemans, chairman of the coffee shop owners' association, which remained open just long enough to provoke two legal conflicts he hopes may ultimately derail the policy.

First, Josemans turned away a group of foreigners who oppose the rule, and who went to the police to file a discrimination complaint. Then he started selling weed to anybody.

Josemans said he planned to continue selling to all, and he fully expects to see his shop closed. His response to that would be to take his case to the European Court of Justice. "Discrimination is never the right answer," he said.

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