A county is not compelled to provide services on lands held in trust by the United States for the Eastern Band of Cherokee Indians, except for public health or human services traditionally provided by county agencies and not otherwise assumed by the Eastern Band of Cherokee Indians, unless there is an agreement between the Eastern Band of Cherokee Indians and the county describing each party’s responsibilities. The agreement must be approved and signed by the Principal Chief of the Eastern Band of Cherokee Indians on behalf of the Eastern Band of Cherokee Indians and must be signed by the county manager or delegated department head. The agreement may be effective for a definite period of time or an indefinite period of time, as specified in the agreement. (2015-262, s. 1(b); 2016-123, s. 2.4(a).)