TRESPASSING

It is unlawful for any person to trespass on the grounds of any state institution of higher education of this state or to damage or deface any of the buildings, statues, monuments, memorials, trees, shrubs, grasses or flowers on the grounds of any state institutions of higher education. Texas Education Code, Chapter 51.98

Unauthorized Persons; Refusal of Entry, Ejection, Identification
The governing board of a state institution of higher education or its authorized representatives, campus police and/or administrators, may refuse to allow persons having no legitimate business to enter on property under the board's control and may eject any undesirable person from the property on his refusal to leave peaceably on request. Identification may be required of any person on the property.