In this chapter, "missing adult" means any person: I. Who is 18 years of age or older; II. Whose residence is in New Hampshire or is believed to be in New Hampshire; III. Who has been reported to a law enforcement agency as missing; and IV. Who falls within one of the following categories: (a) The person is under proven physical or mental disability, thereby subjecting himself or herself or others to personal and immediate danger; (b) The circumstances indicate that the person's physical safety may be in danger; (c) The circumstances indicate that the person's disappearance may not have been voluntary; or (d) The person is missing after a catastrophe.