United States v. Lopez held that the Gun-Free School Zones Act of 1990 was:

• A. Constitutional under the Commerce Clause.
• B. Unconstitutional because it did not substantially affect interstate commerce.
• C. Valid under the Taxing Power.
• D. Justified by the Spending Clause.

Answer: (B)

The key idea here is the limits of federal power under the Commerce Clause and when Congress can regulate non-economic activities. United States v. Lopez clarifies that Congress cannot use the Commerce Clause to regulate purely local, noneconomic conduct unless there is a substantial connection to interstate commerce.

The Gun-Free School Zones Act of 1990 was struck down because it regulated possession of a firearm in a school zone—an activity that is not an economic activity and does not inherently involve interstate commerce. The Court held that this broad regulation did not have a substantial effect on interstate commerce, so it exceeded Congress’s authority under the Commerce Clause.

To understand the boundary, the Court notes that Congress can regulate (1) channels of interstate commerce, (2) instrumentalities of interstate commerce, and (3) activities that substantially affect interstate commerce in an economic sense. A gun possession statute in a school zone doesn’t fit these categories, since it targets a local crime with no clear substantial economic impact on interstate commerce.

This decision marks a narrowing of the Commerce Clause, reinforcing that not all intrastate activities with any potential interstate connection fall under federal regulation.