This is the first time that SCOTUS invalidated Congressional action under the Commerce Clause.
Three areas that Congress may regulate:
Use of channels of ISC
Instrumentalities of ISC—persons or things in ISC
Activities having a substantial relation to ISC or a substantial effect on ISC.
Here: the relation must be substantial
Takeaways:
Instrastate actiivties that don't involve the movement of money are less likely to be deemed to substantiall affect ISC
Statutes often include a jurisdictional hook to bring them within the Commerce Clause's power.
E.g., "It shall be unlawful for any individual knowingly to possess a firearm that has moved in or that otherwise affect interstate or foreign commerce at a place that the individual knows, or has reasonable cause to believe, is school zone."