Which best describes the Posse Comitatus Act?

• A. It restricts the use of military to enforce civilian laws except under constitutional authority, the President, and Congress
• B. It requires the military to enforce civilian laws
• C. It prohibits any military involvement in civilian law enforcement
• D. It gives broad authority to federalize the National Guard

Answer: (A)

The main idea here is that the Posse Comitatus Act limits federal military forces from enforcing civilian law inside the United States, allowing such action only when there is explicit authorization by the Constitution or by Congress. In practice, that means the President can deploy troops or Congress can pass a law to allow it, but otherwise the military should not serve as domestic law enforcement. That’s why the best description is that it restricts military use for enforcing civilian laws except under constitutional authority, the President, and Congress. The other statements conflict with this balance: one implies a duty to enforce, another asserts a total ban, and another suggests broad authority to federalize the National Guard without such authorization.