(a) It shall be the duty of every law enforcement agency to:

(1) Acquire, collect, classify, and preserve any information which would assist in the identification of any deceased individual who has not been identified after the discovery of such deceased individual;

(2) Acquire, collect, classify, and preserve immediately any information which would assist in the location of any missing person, including any minor, and provide confirmation as to any entry for such a person to the parent, legal guardian, or next of kin of that person and the agency shall acquire, collect, classify, and preserve such information from such parent, guardian, or next of kin; and

(3) Exchange such records and information as provided in paragraphs (1) and (2) of this subsection with other law enforcement agencies of this state, any other state, or the United States. With respect to missing minors, such information shall be transmitted immediately to other law enforcement agencies.

(b)(1) For purposes of this subsection, "facility" means a facility pursuant to Chapter 3, 4, or 7 of Title 37, relating to treatment of mentally ill, mentally retarded, and alcoholic or drug dependent persons, or an institution classified as a nursing home pursuant to Code Section 31-7-1.

(2) A person hospitalized or resident in a facility shall be considered to be a missing person at the time such person's unaccounted for absence from that facility is reported by that facility, either by telephone or in writing, to a law enforcement agency.

(c) Any law enforcement agency which receives a report that a person who has Alzheimer's disease or other mental illness involving dementia is missing shall immediately open an investigation for the purpose of determining such person's whereabouts; and no policy for applying any waiting period prior to initiation of a missing persons investigation shall apply in the case of a person who has Alzheimer's disease or other mental illnesses involving dementia.