The Federal Gun Control Act states that One must be EITHER an Unlawful User of, OR Addicted to, a Controlled Substance.
A Medical Marijuana Patient, who is NOT Addicted to Marijuana, should NOT be Deemed to be an Unlawful User of such Substance, as such Federal Act Predates States Deregulation of Marijuana, Especially in The Field of Marijuana Regulation.
A Medical Marijuana Patient is NOT Using a Controlled Substance Unlawfully, at least at a State Level, and, therefore; such Restriciton should ONLY Apply if Federal Arrest Charges were brought by The Federal Drug Enforcement Administration, and ONLY then, if, such Charges were Upheld in The Federal Court Sytem, provided; that The Government can Prove, as an Element, that The Marijuana in Question has Moved in or otherwise Affected Interstate or Foreign Commerce.
Furthermore, The Firearm in Question would HAVE to be a Firearm that has '...Moved in or otherwise Affected Interstate or Foreign Commerce...'.
Firearms that are those of Intrastate Commerce, being those Firearms that are made in and stay in a Certain State, and do NOT Leave that State, would be Exempt under The Ninth Amendment and The Tenth Amendment of The United States Constitution.
The United States did make an Announcement that it would NOT Enforce Federal Marijuana Laws as against Persons who were otherwise in Compliance with State Marijuana Laws, but has since Acted Contrary to This Claim, and This Anouncement is further Rumored to be Untrue and Misleading.
Documentation is Veiwable here: http://www.aclu.org/drug-law-reform/...tate-medical-m