Posse Comitatus Act: Title 10 can be used for domestic law enforcement if...

• A. A presidential executive order alone
• B. Local law enforcement permission
• C. Court approval
• D. Explicit authorization in an Act of Congress or constitutional rebellion

Answer: (D)

The key idea is that federal troops aren’t allowed to enforce domestic law under the Posse Comitatus Act unless there’s a specific statutory authorization by Congress or a constitutional authority during insurrection. Explicit authorization in an Act of Congress or a constitutional basis for dealing with an insurrection are the only legitimate pathways for Title 10 forces to be used in domestic law enforcement. An executive order alone does not override the Act, local permission isn’t sufficient to deploy federal troops, and court approval isn’t the mechanism that authorizes such use.