Editing Commerce Clause (section)

=== The ''Lopez'' rule ===
The opinion set a new rule for what was an acceptable use of congressional power under the Commerce Clause:

* Congress may regulate the use of the channels of interstate commerce;<ref>Heart of Atlanta Motel, Inc. v. United States, 379 U.S. 241, 357 (1964) ('[T]he authority of Congress to keep the channels of interstate commerce free from immoral and injurious uses has been frequently sustained, and is no longer open to question.' " (quoting Caminetti v. United States, 242 U.S. 470, 491 (1917))).</ref>
* Congress is empowered to regulate and protect the instrumentalities of interstate commerce, or persons or things in Interstate Commerce, even though the threat may come only from intrastate activities;<ref>See for example, Shreveport Rate Cases, 234 U.S. 342 (1914)</ref>
* Congress's commerce authority includes the power to regulate those activities having a substantial relation to interstate commerce (activities that substantially affect interstate commerce).<ref>United States v. Lopez, 514 U.S. 549, 558-59 (1995) (citing NLRB v. Jones & Laughlin Steel Corp., 301 U.S. 1, 37 (1937); Maryland v. Wirtz, 392 U.S. 185, 195, n. 27 (1968))</ref>

==== Channels of commerce and the instrumentalities of interstate commerce ====
Channels of commerce represent a broad congressional power that directly regulates the movement of goods and people across state lines.<ref name=":2">{{Cite web|last=Thomas|first=Kenneth R.|date=2014-05-16|title=The Power to Regulate Commerce: Limits on Congressional Power|url=https://digital.library.unt.edu/ark:/67531/metadc306564/|access-date=2021-02-10|website=UNT Digital Library|language=English}}</ref> Importantly, the Court has never required a nexus (causal link) between a state border crossing and the engagement in an activity prohibited by Congress.<ref name=":2" /> In ''United States v. Sullivan'' (1948), the Court held that Section 301k of the Federal Food, Drug, and Cosmetic Act, which prohibited the misbranding of pharmaceutical drugs transported in interstate commerce, did not exceed the congressional commerce power because Congress has the power to “keep the channels of such commerce free from the transportation of illicit or harmful articles.”<ref>''United States v. Sullivan'', 332 U.S. 689 (1948).</ref> Topics in this category include mailing or shipping in interstate commerce, prohibiting crimes where the individual crossed a state line to commit the act, and explosives.<ref name=":2" />

The instrumentalities category allows Congress to make regulations in regards to "the safety, efficiency, and accessibility of the nationwide transportation and communications networks."<ref name=":2" /> It is a significant basis for congressional authority however it has not been fully occupied by Congress.<ref name=":2" />

==== Substantial impact on interstate commerce ====
The substantial impact (or substantial affect) category relates to the power discussed in the Court's 1942 decision in ''Wickard v. Filburn''. It is arguably the strongest categorical power in the ''Lopez'' rule.<ref name=":2" /> In essence, it relates to economic activities which, in the aggregate, have a substantial impact on interstate commerce.<ref name=":2" /> The Court has stopped short of establishing a rule prohibiting the aggregation of all non-economic activity.<ref name=":2" />

In determining whether the activity Congress is attempting to regulate has a substantial effect on interstate commerce, reviewing courts typically consider the following factors:<ref>''United States v. Stewart'', 348 F.3d 1132, 1136-37 (9th Cir. 2003)(citing Morrison, 529 U.S. at 610-12).</ref> <blockquote>(1) whether the regulated activity is commercial or economic in nature; (2) whether an express jurisdictional element is provided in the statute to limit its reach; (3) whether Congress made express findings about the effects of the proscribed activity on interstate commerce; and (4) whether the link between the prohibited activity and the effect on interstate commerce is attenuated.</blockquote>