11.439—Witness tampering.
(a)
A person commits a misdemeanor if, believing that an official proceeding or investigation is pending or about to be instituted, he or she attempts to induce or otherwise cause a witness or informant to:
(4)
Absent himself or herself from any proceeding or investigation to which he or she has been legally summoned.
(b)
A person commits a misdemeanor if he or she harms another by any unlawful act in retaliation for anything lawfully done in the capacity of witness or informant.