OLYMPIA – Major changes to the state’s largely unregulated medical marijuana industry passed the Senate after sponsors beat back a challenge to requirements for a patient database and a plea to let recreational users grow their own. Medical marijuana stores would be regulated by the Liquor Control Board, which currently licenses recreational pot growers and sellers, under a bill drafted by Ann Rivers, R-La Center, and Brian Hatfield, D-Raymond. The agency would expand the number of licensed stores to meet the medical market, and current recreational marijuana stores could get an endorsement to sell special medical strains, which patients could buy without paying some of the heavy taxes on recreational pot.