(a) The commission may require urine samples to be frozen for a period necessary to allow any follow-up testing to detect and identify a prohibited substance. Any other specimen shall be maintained for testing purposes in a manner required by commission rule.
(b) If a test sample or specimen shows the presence of a prohibited substance, the entire sample, including any split portion remaining in the custody of the commission, shall be maintained until final disposition of the matter.
(c) A license holder whose animal test shows the presence of a prohibited substance is entitled to have a split portion of the test sample or specimen tested at a testing facility authorized to perform drug testing under this subtitle and selected by the license holder. The commission shall adopt rules relating to split testing procedures.
Official text of the Texas Occupations Code as published by the Texas Legislative Council.