OLYMPIA - A judge on Friday rejected a request by a medical marijuana user to block Washington state from enforcing tougher "stoned driving" rules after it became one of the first US states to legalize the recreational use of marijuana.

Washington state voters last month approved marijuana legalization by a margin of 56 percent to 44 percent, making the state, along with Colorado, the first in the country to legalize recreational pot use.

The new rules, which for most marijuana smokers would put them over the legal driving limit for a couple hours after taking two or three hits from a joint, took effect on Thursday.

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