The DHS and the Department of Justice should fund research and training on law enforcement and private security cooperation. That's one of the recommendations from a national summit on security-police partnerships that was organized by the International Association of Chiefs of Police (IACP) and funded by the Justice Department's Office of Community Oriented Policing Services. A summary of the summit's recommendations has been published in a document that can be found on SM Online.
A bill (S.B. 55) in the Kentucky legislature would permit jurisdictions in the state to enter into mutual-aid agreements with other states to share first-responder personnel in case of an emergency. The bill would also extend the same immunity to these first responders as is afforded to those from within Kentucky.