4 – 19. Retesting specimens a. Positive urine specimens maybe retested if a sufficient quantity of the specimen is available and a written request for retesting is submitted by (1) The unit commander, the MRO, or an attorney representing the Soldier. (2) The Soldier whose specimen tested positive, but only through their commander or attorney. (3) Request by the president or recorder of an administrative board. (4) An order of a court-martial or request made pursuant to the rules for court-martial. b. A Soldier whose urine has tested positive for illicit drugs may obtain a retest at any DoD FTDTL, at no cost to the Soldier, when a sufficient quantity of the specimen is available for retesting. Only an aliquot of approximately 1 – 2 milliliters will be released for such testing. The original specimen and bottle will be maintained at the original DoD laboratory. The specimen must be forwarded using a chain of custody procedure and by a method that ensures the Government is not obligated to pay for the testing if the specimen is sent to a commercial laboratory. c. A Soldier whose urine has tested positive for illegal drugs may obtain a retest at a commercial laboratory (Substance Abuse and Mental Health Service Administration approved) outside the DoD laboratory system at the Soldier's own expense when a sufficient quantity of the same specimen is available for retesting.