Prior to euthanasia, each animal should first be scanned for microchip identification and searched for identification tattoos; at minimum, the abdomen, inner thighs, and inside ear flaps should be searched for tattoos. If identification is located on an animal or the animal is wearing a tag(s), reasonable efforts to locate and notify the animal's owner shall be made and documented prior to euthanasia.
25 Tex. Admin. Code § 169.83