PDF National Guard fact sheet with section on State Mission
Governor can activate to State Active Duty, Posse Comitatus Act doesn't apply.
Under state law, support provides protection to life and property, may be mobilized for peace enforcement missions, counter drug missions, support to civil authorities.
PDF Memorandum of Understanding Between The Arizona National Guard and The Department of The Interior
Has section on Arrests, Searches, Seizures, Chain of Custody
Section on weapons
Normally an unarmed support to law enforcement, not authorized to make arrests, etc.
Elevated situation with orders from appropriate authority allow weapons and ammunition.
Major General Peter Alward speech to House Homeland Security Committee, PDF
Cites support to Law Enforcement In Denver Colorado and various other unnamed local law enforcement agencies. Mostly counter drug support. Cites NG personnel along border supporting federal, state, and local law enforcement agencies with mostly counter drug missions which mostly involve aerial and ground observation, communications, case analysis, and engineering.
Cites support of Border Patrol with road building and maintenance, transportation, medical / dental.
Capable of other assistance to civil authority based on situationsl need.
Arizona Army National Guard http://www.absoluteastronomy.com/top...d#encyclopedia
Has dual Federal and state missions. State Missions range from from limited actions during non-emergency situations to full scale law enforcement of martial law when local law enforcement officials can no longer maintain civil control.
The Governor may call individuals or units of the Arizona National Guard into state service during emergencies or to assist in special situations which lend themselves to use of the National Guard. The state mission assigned to the National Guard is "To provide trained and disciplined forces for domestic emergencies or as otherwise provided by state law."
Unlike Army Reserve members, National Guard members cannot be mobilized individually (except through voluntary transfers and Temporary Duty Assignments , or TDY), but only as part of their respective units. However, there has been a significant amount of individual activations to support military operations; the legality of this policy is a major issue within the National Guard.