On the request of a local law enforcement agency that knows a child is missing but has not verified the criteria described by Section 411.355(a), and if the chief law enforcement officer of the local law enforcement agency believes that activation of the alert system is warranted, the department shall:
(1) activate the alert system only in the following areas:
(A) within a 100-mile radius of the location from which the child is believed to have gone missing or the location in which the child was last seen, as applicable; and
(B) in all counties adjacent to the county from which the child is believed to have gone missing or the county in which the child was last seen, as applicable; and
(2) notify appropriate participants in the alert system, as established by rule.