Tex. Government Code § 411.355

(a) On the request of a local law enforcement agency regarding an abducted child, the department shall activate the alert system and notify appropriate participants in the alert system, as established by rule, if:

(1) the local law enforcement agency believes that a child has been abducted, including a child who:

(A) is younger than 14 years of age; and

(B) regardless of whether the child departed willingly with the other person, has been taken from the care and custody of the child's parent or legal guardian without the permission of the parent or legal guardian by another person who is:

(i) more than three years older than the child; and

(ii) not related to the child by any degree of consanguinity or affinity as defined under Subchapter B, Chapter 573, Government Code;

(2) the local law enforcement agency believes that the abducted child is in immediate danger of serious bodily injury or death or of becoming the victim of a sexual assault;

(3) the local law enforcement agency confirms that a preliminary investigation has taken place that verifies the abduction and eliminates alternative explanations for the child's disappearance; and

(4) sufficient information is available to disseminate to the public that could assist in locating the child, a person suspected of abducting the child, or a vehicle suspected of being used in the abduction.

(b) On the request of a local law enforcement agency regarding a missing person with an intellectual disability, the department shall activate the alert system and notify appropriate participants in the alert system, as established by rule, if:

(1) the local law enforcement agency receives notice of a missing person with an intellectual disability;

(2) the local law enforcement agency verifies that at the time the person is reported missing:

(A) the person has an intellectual disability, as determined according to the procedure provided by Section 593.005, Health and Safety Code; and

(B) the person's location is unknown;

(3) the local law enforcement agency determines that the person's disappearance poses a credible threat to the person's health and safety; and

(4) sufficient information is available to disseminate to the public that could assist in locating the person.

(c) The department may modify the criteria described by Subsection (a) or (b) as necessary for the proper implementation of the alert system.