(a) A veterinarian must personally sign any official health documents issued by the veterinarian, and/or any official health documents for which the veterinarian has received compensation, regardless of whether said compensation is ultimately refunded, provided, however, that rabies certificates may be authenticated by either:(1) the veterinarian's personal signature; or(2) the use of a signature stamp or electronic signature by a non-licensed employee under direct supervision of the veterinarian.(b) The issuance of any pre-signed or pre-stamped official health documents by a veterinarian is prohibited.(c) Unless otherwise prohibited by law, and except as provided in subsection (d) of this section, a veterinarian may permit a non-licensed employee under the veterinarian's direct supervision, or under the immediate supervision of a licensed veterinary technician, to collect samples from animals for official tests.(d) A person approved by the Texas Animal Health Commission (TAHC) and under the general supervision of a TAHC approved veterinarian may perform testing for brucellosis at a livestock market or collect blood samples on animals to be consigned directly from the ranch to slaughter and submit them to the state/federal laboratory for brucellosis testing.