Marijuana to be removed as Schedule 1 drug

You work for a cannabis advocacy group that wants marijuana to be removed as a Schedule 1 drug. Read the text of the CSA. Draft a legal memo to the head of your group, addressing the following:

1.    Is this possible? If so, describe who has the authority to remove marijuana and what that process would be. If not, why not?

2.    Does the federal CSA pre-empt Colorados law? Explain.

3.    Can these two laws co-exist or does the CSA leave no room for legalization?

Utilize sources below AND find 2 additional sources.
https://www.deadiversion.usdoj.gov/21cfr/21usc/811.htm
https://www.scotusblog.com/case-files/cases/nebraska-and-oklahoma-v-colorado/
https://www.supremecourt.gov/opinions/15pdf/144orig_6479.pdf

Format on how to write legal memo
https://www.upcounsel.com/how-to-write-a-legal-memorandum-for-dummies