Heh. Prohibition is snake bit. Expect a lot of drama before it's truly dead. The only reason it could ever stand & be marginally effective was because of state law & local enforcement, not to mention decades of reefer madness propaganda. There never was any Justice to it.
It was broken back in 1996 when the Clinton Admin allowed MMJ in CA and damaged beyond repair with the passage of A64 here in CO in 2012. President Mitt could have shut down Retail but the Feds can't effectively enforce possession & personal cultivation prohibition w/o local support. They don't have the manpower or the support of the population required to avoid jury nullification, either, prosecutors' worst nightmare.
Forced to choose, Obama & Holder did the right thing. The only thing Trump & Sessions can accomplish is to force it underground, deny state revenue & provide market opportunities for criminal cartels. It would also engender more disrespect for the Law than we already have.
The other side of it is that well cultivated fear of the unknown is fading fast because, unsurprisingly, facts really do have a Liberal bias. With all the data gathered here in CO it's perfectly obvious that legalization is superior public policy. Even poorly informed country folk in Jeff's home state know that CO isn't suffering from the effects.
Ol' Jeff can go post-truth with this if he wants but I don't think it will sell & will actually damage Admin credibility even further.
Every dollar spent on Federal (and State) marijuana law enforcement is a dollar diverted from law enforcement wrt to drugs that ruin lives & kill people. Not that Jeff seems to care about much other than making the prison industrial complex into more of a profit center than it already is-
http://www.huffingtonpost.com/entry/doj-private-prisons-sessions_us_58af529ce4b0a8a9b780669a
It really doesn't matter who gets locked up or why when there's money to be made. Not to the stockholders- the more the merrier, just so long as it's not them.