Ever since Colorado and Washington became the first two states to approve marijuana legalization initiatives in 2012, additional states have joined them in each biennial election that has followed.
The Trump administration on Thursday will free federal prosecutors to more aggressively enforce marijuana laws, effectively threatening to undermine the legalization movement that has spread to six states, most recently California.
The D.C. Council has approved a measure that would allow medical marijuana users from other jurisdictions to use their out-of-state registration cards to purchase cannabis in the District.