SEATTLE (AP) — Dozens of government officials and researchers from a half-dozen U.S. states and a few countries that have legalized marijuana or are at least thinking about it are gathering in Washington state for meetings focused largely on one question: How do we know if it's working?

Organizers say it's crucial to get a better handle on what data are being collected about the impacts of legalization and to consider what further research is needed. Otherwise, it's going to be tough to quantify how this major social policy change is affecting everything from school suspension rates to traffic fatalities.

The conference has drawn officials from the legal pot states of Washington, Colorado, Oregon and Alaska, as well as Vermont and California.

Other attendees have come from Jamaica, Uruguay, Mexico and Colombia.

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