Changes in state laws could usher in even more confusion for law enforcement and escalate the pressure on Congress to act.

More than 40 U.S. states could allow some form of legal marijuana by the end of 2020, including deep red Mississippi and South Dakota — and they’re doing it with the help of some conservatives.

State lawmakers are teeing up their bills as legislative sessions kick off around the country, and advocates pushing ballot measures are racing to collect and certify signatures to meet deadlines for getting their questions to voters.

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Mona Zhang ~ Politico.com ~