it is promising, but there's not enough data to say this for sure. decriminalizing it will make running studies easier.

Will it though? The feds could still come after you if you're publishing research that admits possession, etc.

They aren't doing that with the researchers here in California openly attempting to find marketable ways to exploit legal marijuana.

It can change with administration changes because that allowance is made under executive order (which is probably an abuse, but that's another story). There is one federally approved lab down in Louisiana that has been doing this research for decades.