Texas Civil Practice and Remedies Code - CIV PRAC & REM § 77.004. Blood Bank:  Compensation of Seller

(a) This section applies only to a blood bank licensed either by the Division of Biological Standards of the National Institute of Health or by the American Association of Blood Banks.

(b) A blood bank may not pay cash for blood.  A blood bank may not pay a blood seller by check unless the check is sent by United States mail to the seller after the 15th day following the day the blood is taken from the seller.

(c) If a blood bank violates Subsection (b) and the blood contains harmful substances, the blood bank is not entitled to the immunity established by this chapter.  The blood bank has the burden of establishing that the blood was not purchased in violation of Subsection (b).