Even in the eminently complicated world of pot politics, the prospect is mind-boggling: In the May municipal election, Los Angeles voters could face not one but three ballot measures geared toward regulating medical marijuana.

Each of the proposals would allow some pot shops to remain open. The differences between them are small and all in the details.

Two of the proposed measures, which qualified for the ballot last week, are backed by opposing groups in the medical marijuana industry. One would allow only those dispensaries that opened before a city moratorium in 2007. The other would allow all pot shops that meet certain requirements, such as keeping limited hours and maintaining a certain distance from schools and churches. The second ballot measure would also raise taxes on medical marijuana sales...

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