Tex. Codes » Transportation Code · TITLE 7. VEHICLES AND TRAFFIC · SUBTITLE B. DRIVER'S LICENSES AND PERSONAL IDENTIFICATION CARDS · CHAPTER 524. ADMINISTRATIVE SUSPENSION OF DRIVER'S LICENSE FOR FAILURE TO PASS TEST FOR INTOXICATION
Texas Codes

Tex. Transp. Code § 524.038 (2026)

Instrument Reliability And Analysis Validity

✓ current as of May 2026
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Sec. 524.038. INSTRUMENT RELIABILITY AND ANALYSIS VALIDITY. (a) The reliability of an instrument used to take or analyze a specimen of a person's breath to determine alcohol concentration and the validity of the results of the analysis may be attested to in a proceeding under this subchapter by affidavit from the certified breath test technical supervisor responsible for maintaining and directing the operation of breath test instruments in compliance with department rule.

(b) An affidavit submitted under Subsection (a) must contain statements on:

(1) the reliability of the instrument and the analytical results; and

(2) compliance with state law in the administration of the program.

(c) An affidavit of an expert witness contesting the reliability of the instrument or the results is admissible.

(d) An affidavit from a person whose presence is timely requested under this section is inadmissible if the person fails to appear at a hearing without a showing of good cause. Otherwise, an affidavit under this section may be submitted in lieu of an appearance at the hearing by the breath test operator, breath test technical supervisor, or expert witness.

Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.

Notes of Decisions
Cited in 18 cases, 1997–2018 · leading case: Mireles v. Texas Dep't of Pub. Saf., 9 S.W.3d 128 (Tex. 1999).
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Mireles v. Texas Dep't of Pub. Saf., 9 S.W.3d 128 (Tex. 1999). “See Tex. Transp. Code § 524.038 (mandating the admissibility of alcohol-concentration evidence); see also Stevenson v.”
Texas Dep't of Pub. Saf. v. Seidule, 991 S.W.2d 290 (Tex. App. 1998). · cites it 6× “Tex. Transp. Code Ann. § 524.038 (b) (Vernon 1998).”
Mireles v. Texas Dep't of Pub. Saf., 993 S.W.2d 426 (Tex. App. 1999). · cites it 2× “See TEX. TRANSP. CODE ANN. § 524.038 (Vernon Pamph.”
Texas Dep't of Pub. Saf. v. Jimenez, 995 S.W.2d 834 (Tex. App. 1999). · cites it 3× “Tex. Transp. Code Ann. § 524.038 (West 1999).”
Texas Dep't of Pub. Saf. v. Cortinas, 996 S.W.2d 885 (Tex. App. 1998). · cites it 2× “Tex.Transp.Code Ann. § 524.038 (Vernon Pamph.”
Texas Dep't of Pub. Saf. v. Cantu, 944 S.W.2d 493 (Tex. App. 1997). “Tex.TRAnsp.Code Ann. § 524.038 (Vernon Supp.”
Texas Dep't of Pub. Saf. v. Nordin, 971 S.W.2d 90 (Tex. App. 1998). “Tex.TRANs.Code Ann. § 524.038 (Vernon Pamph.”
Phillips v. Texas Dep't of Pub. Saf., 362 S.W.3d 252 (Tex. App. 2012). · cites it 2× “See Tex. Transp. Code Ann. § 524.038 (a)-(c) (West 2007).”
Shashikant C. Patel v. Texas Dep't of Pub. Saf., 409 S.W.3d 765 (Tex. App. 2013). “Tex. Transp. Code Ann. § 524.038 (Vernon 2007) (emphasis added).”
Texas Dep't of Pub. Saf. v. Paul Robert Durand, 994 S.W.2d 352 (Tex. App. 1999). · cites it 5× “See Tex. Transp. Code Ann. § 524.038 (West 1999).”
Texas Dep't of Pub. Saf. v. Willie Ersell McCulloch (Tex. App. 1999). · cites it 3× “Tex. Transp. Code Ann. § 524.038 (c) (West 1999).”
Texas Dep't of Pub. Saf. v. Alexandro Molina Jimenez (Tex. App. 1999). · cites it 3× “Tex. Transp. Code Ann. § 524.038 (West 1999).”
Show all 18 citing cases →
— Tex. Transp. Code § 524.038(a) — 1 case
Texas Dep't of Pub. Saf. v. Jose Tovar Baez (Tex. App. 2018).
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