Free tool · The Legislature
Does Congress Have the Power to Pass This Law? A Power Analyzer
Congress has only the powers that the Constitution enumerates, plus those that are necessary and proper to carry them out. Under the commerce power it may regulate the channels and instrumentalities of interstate commerce and economic activity that in the aggregate substantially affects it, but not purely local, non-economic activity with only an attenuated effect (Lopez, Morrison), and the Supreme Court has held that it cannot compel people to buy a product. Under the spending power it may attach conditions to federal funds that are unambiguous, related to the federal interest and not coercive. Under the taxing power it may levy charges that function as taxes. Even a law within a power is invalid if it violates individual rights or commandeers state governments.
Tool · Congressional Power Analyzer
The law is likely within Congress’s power on this basis.
Commerce power: substantial effects (economic activity): Congress may regulate economic activity that, taken in the aggregate, substantially affects interstate commerce (Wickard v Filburn). Courts defer to a rational basis for finding that effect where the activity is economic.
- Congress has only the powers that the Constitution enumerates, together with those that are ‘necessary and proper’ to carry them out (McCulloch v Maryland). Even a law within a power is invalid if it violates a limit, such as an individual right, the structure of federalism or the separation of powers.
- The reach of the commerce, spending and taxing powers has been reshaped by the Supreme Court in recent decades and may change again. This tool states the main tests in simplified form.
Tests an invented federal law against the power it relies on, commerce, spending, taxing, Section 5 of the Fourteenth Amendment or the Necessary and Proper Clause, and against the limits of individual rights and federalism (anti-commandeering). It states the main tests in simplified form; the doctrine moves with each major decision. A teaching aid, not legal advice. Runs in your browser; nothing is stored or sent.
How to use it
- Choose the power the law relies on.
- Answer the questions that power raises, such as what activity is regulated or what conditions are attached.
- Tick whether the law commands state officials or violates an individual right.
- Read whether the law is likely within Congress’s power.
Common questions
What is the anti-commandeering rule?
Congress may not command state legislatures or officials to enact or administer a federal program. It may regulate private parties directly or encourage states with conditions on funds.
What is the Necessary and Proper Clause?
It allows Congress to pass laws rationally related to carrying out an enumerated power. It is not a separate power: it needs an enumerated power to attach to.
Is the doctrine settled?
No. The reach of the commerce, spending and taxing powers has changed with major decisions and may change again.
Learn the law behind the tool
This tool is part of our The Legislature course, with lectures, concept maps, flashcards, interactive exercises and a capstone case. The Legislature: Congress, Structure and Powers.
More free law tools
General information, simplified, mainly on American law, not legal advice. States and countries differ, and real cases turn on facts that a tool cannot capture.