Notable new CRS report on ways a President could legalize or decriminalize marijuana at the federal level

I was intrigued to see this notable new five-page Congressional Research Service report titled "Does the President Have the Power to Legalize Marijuana?". Here is how it gets started:

The legal status of marijuana has been a topic of recurring interest in recent years, as states, federal legislators, and federal executive agencies consider how to regulate cannabis and its derivatives.  What role can the President play in determining the legal status of a controlled substance such as marijuana?  That question came to the forefront during the 2020 Democratic presidential primary, with multiple candidates supporting legalization of marijuana and several pledging to legalize the substance nationwide if elected, either indirectly through administrative proceedings or directly by executive order.  More recently, some commentators have called on President Biden to end criminal penalties for marijuana possession and use or grant clemency to federal marijuana offenders.  Although the President cannot directly remove marijuana from control under federal controlled substances law, he might order executive agencies to consider either altering the scheduling of marijuana or changing their enforcement approach.

This Sidebar outlines the laws that apply to controlled substances like marijuana, then analyzes several approaches a president might take to change controlled substances law as written or as enforced.  The Sidebar closes with a discussion of key considerations for Congress related to presidential power over controlled substances regulation.