The Supreme Court ruling has affected California and the 10 other states that allow some uses of medical marijuana. The other states are Alaska, Colorado, Hawaii, Maine, Maryland, Montana, Nevada, Oregon, Vermont and Washington.

Last week's ruling by the US Supreme Court upheld federal authority over marijuana. But even before that, authorities in states such as California, where marijuana's use for medical purposes is legal, had begun to question how much of the drug was enough, the New York Times reported Wednesday.

Six-Month Moratorium

Last month, the San Francisco Board of Supervisors imposed a six-month moratorium on new marijuana clinics after health officials counted at least 43 unregulated facilities, the Times said.

A San Francisco police officer says more marijuana is on the streets now than at any other time. He said countless dealers used the marijuana clinics or dispensaries as a cover for illegal sales, the report said.

In the past year, at least five California cities have banned such dispensaries.

The Supreme Court ruling has affected California and the 10 other states that allow some uses of medical marijuana. The other states are Alaska, Colorado, Hawaii, Maine, Maryland, Montana, Nevada, Oregon, Vermont and Washington.