When does the Posse Comitatus Act apply to a state National Guard forces?

Answer 1

The Posse Comitatus Act primarily restricts the use of federal military forces in civilian law enforcement roles, but it also applies to state National Guard forces when they are federalized and operating under Title 10 of the U.S. Code. When state National Guard units are activated by the federal government, they are subject to the same restrictions as active-duty military personnel regarding involvement in domestic law enforcement. However, when National Guard forces are operating under state authority (Title 32), the Posse Comitatus Act does not apply, allowing states more flexibility in using their National Guard for law enforcement purposes.