TULSA, Okla. (AP) — Records show that energy companies were the biggest donors to an Oklahoma campaign against medical marijuana.

Oklahoma Ethics Commission records show nearly half of the roughly $1.3 million donated to the committee opposing medical marijuana came from the energy industry, The Tulsa World reported . The committee, titled SQ 788 Is Not Medical, received donations from April 1 to June 30 from companies in Oklahoma, Colorado and Texas.

Oklahoma voters approved the implementation of a state-run legal medical marijuana program on the June 26 ballot despite the well-funded opposit...