Effort to change U.S. marijuana laws seen as building

Monday, February 4, 2013 | 8:57 p.m. CST; updated 9:45 p.m. CST, Monday, February 4, 2013

SEATTLE — An effort is building in Congress to change U.S. marijuana laws, including moves to legalize the industrial production of hemp and establish a hefty federal pot tax.

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