Texas Education Code - EDUC § 51.232. Identification of Persons on Campus

(a) During periods of disruption, as determined by the chief administrative officer of a state-supported institution of higher education, the chief administrative officer, or an officer or employee of the institution designated by him to maintain order on the campus or facility of the institution, may require that any person on the campus or facility present evidence of his identification, or if the person is a student or employee of the institution, his student or employee official institutional identification card, or other evidence of his relationship with the institution.

(b) If any person refuses or fails upon request to present evidence of his identification, or if the person is a student or employee of the institution, his student or employee official identification card, or other evidence of his relationship with the institution, and if it reasonably appears that the person has no legitimate reason to be on the campus or facility, the person may be ejected from the campus or facility.