Because it is probable that the pattern and detail of the machinery for mutual aid among two or more jurisdictions may differ from that among the jurisdictions that are party to this compact, this compact contains elements of a broad base common to all jurisdictions, and nothing in this compact precludes any jurisdiction from entering into supplementary agreements with another jurisdiction or affects any other agreements already in force among jurisdictions. Supplementary agreements may include but are not limited to provisions for evacuation and reception of injured and other persons and the exchange of medical, fire, public utility, reconnaissance, welfare, transportation and communications personnel, equipment, and supplies. (Added 2003, No. 121 (Adj. Sess.), § 84, eff. June 8, 2004.)