So what's stopping the Democratic House from passing legislation removing cannabis from that list?

Passing it loudly and publicly and sending it to the Senate with much ado and as much fanfare as possible so that Mitch McConnell gets asked about it.

He is very much pro hemp and Kentucky has always been a big weed producer. Kentucky power brokers want de-classified weed.

So what's up with that? Is congress waiting for this to go through the courts too?
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"Be yourself; everyone else is already taken." Oscar Wilde