4 Tex. Admin. Code § 24.27 – Testing Procedure

(a) The laboratory shall test samples in accordance with the Department "Testing Procedure".
(b) The laboratory shall maintain the chain of custody of each sample using a form prescribed by the Department.
(c) The laboratory shall retain the sample for a minimum of thirty (30) business days from the sample collection date.

Source Note:The provisions of this §24.27 adopted to be effective March 11, 2020, 45 TexReg 1655.