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The two states, Nebraska and Oklahoma, began legal proceedings months after Colorado began allowing marijuana dispensaries to start selling pot for recreational use at the start of 2014.
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Oil is big business in Oklahoma, and the industry has been a boon for many cities here. But there are concerns that techniques used for extracting oil are behind a surge in temblors in the state.
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Nebraska and Oklahoma have filed a lawsuit against Colorado with the U.S. Supreme Court, saying that its law legalizing marijuana isn't constitutional.