37 Tex. Admin. Code § 28.4
A criminal justice or law enforcement agency or DNA laboratory may not collect, and the director may not accept, a sample taken from a person who is not deceased, whether submitted voluntarily or as required by this chapter, unless:
(1) a blood sample is collected in a medically approved manner by:
Source Note:The provisions of this §28.4 adopted to be effective February 7, 2005, 30 TexReg 407; amended to be effective April 30, 2007, 32 TexReg 2370.