No law shall be revived or amended by reference to its title; but in such case the act revived, or the section or sections amended, shall be re-enacted and published at length.
Tex. Const. art. 3, § 36, under Legislative Department.
Tex. Const. art. 3, § 36
REVIVAL OR AMENDMENT BY REFERENCE PROHIBITED; RE-ENACTMENT AND PUBLICATION AT LENGTH
No law shall be revived or amended by reference to its title; but in such case the act revived, or the section or sections amended, shall be re-enacted and published at length.