Amends GS 160A-288 (Cooperation between law enforcement agencies) by removing the limitation in subsection (a) that a law enforcement agency may only provide assistance to another agency to enforce the laws of North Carolina, and by adding to subdivision (b)(2) a definition of agency in addition to law enforcement agency, as well as expanding those definitions to include a municipal police department or sheriff's office of another state if the laws of the other state allow for mutual aid with an out-of-state agency.  Requires adherence to GS 15A-403 (regarding authority and procedures for arrest by officers from other states).