Judge Alex Kozinsky wrote the
Opinion of the 9th Circuit in the case of
US vs Stewart. At issue was whether a machine gun designed and manufactured for personal use affected interstate commerce enough to come under federal jurisdiction. The 9th said it did not.
The Supreme Court later ordered that case remanded back to the 9th for reconsideration in light of their conclusion in
Gonzalez vs Raich. At issue was whether a cannabis plant grown for personal medical use affected interstate commerce enough to come under federal jurisdiction. The Supremes said it did.
The 9th reconsidered the Stewart case, and Kozinsky wound up writing an
opinion more or less opposite of his previous one.