ON APPELLANT’S MOTION FOR REHEARING
Appellant’s motion for rehearing is denied. Our opinion of August 29, 1990 is withdrawn and this opinion is substituted.
*898 A jury convicted appellant of driving while intoxicated, and the court assessed punishment at 45 days’ confinement, probated for two years, and a $400.00 fine. Appellant raises eleven points of error, contending that (1) the court erred in failing to suppress evidence of a bottle of Jim Beam whiskey found in his car; (2) article 6701Z-5, § 8(a) and (b), and the Texas Breath Alcohol Testing Regulations are unconstitutional; and (3) the court erred in admitting evidence of the results of the intoxilyzer test performed on him because that test is not scientifically reliable. We affirm.
Appellant was stopped by a police officer who had witnessed him make a U-turn at an unsafe speed, and had seen his car straddle the lane dividers three times. The officer testified that appellant stumbled as he got out of the car, he smelled a strong odor of alcohol on appellant’s breath, appellant’s speech was slurred, and his balance was unsteady. The officer had no doubt that appellant was intoxicated and arrested him for driving while intoxicated. Two passengers in appellant’s car were told that they were free to go. Appellant authorized one of the passengers to drive his car home, but the officer would not allow it. He testified that it was the policy of the Leon Valley Police Department to impound the vehicles of persons arrested for DWI for safekeeping. The car was searched at the scene, and a 1.75 liter bottle of Jim Beam whiskey was found in the passenger compartment. Appellant moved to suppress evidence of the bottle, but that motion was denied and the bottle was introduced into evidence.
A second police officer testified that he was a certified breath test operator, that he performed a breath test on appellant using a certified model 4011 ASA intoxilyzer, and that the machine performed properly. The results of that test showed that appellant had an alcohol concentration of 0.18%. The breath test technical supervisor for Bexar County testified that the model intoxilyzer and the particular machine upon which appellant was tested were approved and certified by the Department of Public Safety. He further testified that the intoxilyzer operated on generally accepted scientific principles, and that it was regarded as accurate by the scientific community. He had personally participated in a study comparing the accuracy of the intoxilyzer with other methods of measuring alcohol concentration, including a blood test, and had found the intoxilyzer to be comparable to those other methods.
Appellant produced expert testimony from two witnesses who stated that the particular model intoxilyzer at issue was unreliable and did not produce accurate results. One of these witnesses stated that the instrument works on an erroneous assumption regarding the ratio of alcohol in the blood to alcohol in the breath, and that the test is not reliable because its results cannot be duplicated. He concluded that the intoxilyzer is not accepted by the specific scientific community of which he is a member, that being scientists engaged in education and research. This witness, though an expert on the analysis and identification of chemical substances, had no training or practical experience with the intoxilyzer.
I. MOTION TO SUPPRESS
In points of error one and two, appellant contends that the court erred in failing to suppress evidence of the bottle of Jim Beam and in holding that the inventory search was justified because it was made in good faith. While there was considerable discussion at trial and in the briefs on appeal relating to the propriety of the search as an inventory following impoundment of the vehicle, we note that the State also urged, both at trial and on appeal, that the search was proper as incident to the lawful arrest of appellant for DWI. It is well-settled that “when a policeman has made a lawful custodial arrest of the occupant of an automobile, he may, as a contemporaneous incident of that arrest, search the passenger compartment of that automobile.”
New York v. Belton,
453
*899
U.S. 454, 460,
Appellant contends on rehearing that we “incorrectly characterized the inventory as a search incident to the arrest, which significantly and impermissibly changes the facts of the case.” He then argues that the officer who arrested him testified only in terms of an inventory search. As previously noted, the state argued at trial that the search was permissible both as an inventory and as a search incident to arrest. Even if it had not done so, we would sustain the search on the alternate ground of search incident to arrest. “The State does not have the burden of listing or verbalizing in the trial court every possible basis for holding a search legal or else waive that basis for urging on appeal the validity of the search.”
Lewis v. State,
The evidence in the present case supports the court’s ruling on the motion to suppress on the theory of search incident to arrest. Because the court properly denied the motion to suppress on this basis, we need not also determine whether there was a valid inventory search following a lawful impoundment. Points of error one and two are overruled.
II. CONSTITUTIONAL CHALLENGES
In points of error three through eight, appellant challenges the constitutionality of TEX.REV.CIV.STAT.ANN. art. 6701/-5, § 3(a) and (b), and the Texas Breath Alcohol Testing Regulations. In reviewing the constitutionality of a statute, we must presume that the statute is valid and that the legislature did not act unreasonably or arbitrarily in enacting it.
Ex parte Granviel,
A. Separation of powers.
In points of error three and four, appellant contends that the statute and regulations are unconstitutional because they are in violation of the separation of powers clause. He urges that only the legislature has the power to establish or change laws concerning the rules of evidence, but that article 6701Z-5, § 3(a) and (b) purport to confer this power on the Department of Public Safety (DPS), which is part of the executive branch. Clearly “the power to adopt or amend rules of evidence belongs to the legislature.”
State v. Muller,
at 319. The Court of Criminal Appeals, however, has upheld the right of the legislature to delegate rule-making authority to the DPS.
Id.,
citing
Langford v. State,
The only authority that the legislature delegated to the DPS in article 67011-5, *900 was to prescribe the rules for certification of breath testing equipment and individuals operating the equipment. The legislature did not delegate any authority to DPS, nor has DPS assumed any, to promulgate rules of evidence.
State v. Muller, at 319. Because there was no improper delegation of power, the statute and regulations do not violate the separation of powers doctrine. Points of error three and four are overruled.
B. Due process—notice, vagueness, and discretion.
In points of error five and six, appellant contends that the statute is unconstitutional because the DPS regulations enacted thereunder are vague and do not give reasonable notice of their terms.
Due process requirements of specificity in a criminal statute are based on the need for adequate notice of what behavior is prohibited. The Constitution does not require impossible standards; all that is required is that the language conveys a sufficient warning as to the proscribed conduct when measured by common understanding and practices.
Reeves v. State,
In point of error seven, appellant asserts that the statute is unconstitutional because it vests improper discretion in the scientific director of the DPS. When faced with the same challenge, the court in Muller stated
[t]he only authority the statute delegates to the DPS is to prescribe the appropriate rules for breath analysis, certification of the equipment, and those operating it. [Citations omitted.] In Ex parte Gran-viel, the Court of Criminal Appeals held that it was not an unconstitutional delegation of authority to the director of the Texas Department of Corrections to prescribe the appropriate chemical to be used when giving lethal injections.561 S.W.2d at 513 . The court rejected the argument that the delegation of authority was unconstitutional just because the director could choose an arbitrary means of enforcement. Id. The courts will not presume that the scientific director of the DPS will act in an arbitrary manner without evidence.
Muller v. State, at 320. There is no evidence in the present case that the scientific director acted in an arbitrary manner in prescribing the challenged rules. Point of error seven is overruled.
C. Due process—accuracy and reliability.
In point of error eight, appellant contends that the statute and the regulations are unconstitutional because they fail to insure the accuracy or reliability of in-toxilyzer evidence. He urges specifically that they fail to require that the instrument utilized to determine a defendant’s alcohol' concentration be scientifically appropriate and reliable to perform analysis on a human breath specimen. In addition to section 19.1(b)(3) 1 of the Breath Alcohol Testing Regulations, upon which appellant *901 relies in his brief, section 19.1 clearly provides
(b) In order to be certified each brand and/or model of breath testing instrument must meet the following criteria:
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(4) The specificity of the procedure shall be adequate and appropriate for the analyses of breath specimens for the determination of alcohol concentration in traffic law enforcement.
(5) Any other tests deemed necessary by the Scientific Director to correctly and adequately evaluate the instrument to give correct results in routine breath alcohol testing and be practical and reliable for traffic law enforcement purposes.
(emphasis added); see State v. Muller, at 320. We hold that the regulations adequately provide that the methods to be used must ensure that the test is accurate and appropriate for analyzing human breath. Id. “Breath” obviously refers to human breath. The statute that defines the offense speaks in terms of a “person’s” breath. See TEX.REV.CIY.STAT.ANN. art. 6701Z-5, § 3 (Vernon Supp.1990). The statute and the regulations do not fail to ensure the accuracy or reliability of the test on human defendants, and do not violate due process. Point of error eight is overruled.
III. ADMISSIBILITY OF INTOXILYZER RESULTS
In points of error nine, ten, and eleven, appellant asserts that the court erred, and violated his due process rights, in admitting the results of intoxilyzer model 4011-AS A because the scientific theory upon which it is based is not accepted in the scientific community as an accurate means of measuring human alcohol concentration. The predicate required for admissibility of the results of an intoxilyzer test is to show
[1] the existence of periodic supervision over the machine and operation by one who understands scientific theory of the machine; and [2] proof of the result of the test by a witness or witnesses qualified to translate and interpret such result so as to eliminate hearsay.
Harrell v. State,
In
Slagle v. State,
Further, the admissibility of the intoxilyzer results did not rest solely on the inclusion of intoxilyzer testing within the scope of article 6701Z-5, § 3, but was also supported by the testimony of the breath test technical supervisor for Bexar County.
See Gandara v. State,
Appellant asserts that the jury could not have given credence to the intoxi-lyzer results because the testimony of his experts, attacking the reliability of the instrument, created a reasonable doubt as a matter of law. But the trier of fact is the sole judge of the credibility of the witnesses and the weight to be given their testimony.
Bowden v. State,
Finally, insofar as appellant attacks the sufficiency of the evidence to support his conviction, we note that the evidence is sufficient even if we were to disregard the results of the intoxilyzer test. The complaint and information under which appellant was charged alleged both that he had an alcohol concentration of 0.10 or more in his body, and that he did not have the normal use of his mental and physical faculties by reason of the introduction of alcohol into his body. The jury returned a general verdict, stating only that appellant was guilty. The arresting officer testified that appellant’s balance was unsteady, his speech was slurred, and there was a strong odor of alcohol on his breath. The officer testified that he had no doubt that at the time of the arrest appellant had lost the normal use of his mental and physical faculties, and that he was intoxicated. This testimony alone was sufficient to support the conviction under the second paragraph of the complaint and information.
See Annis v. State,
The judgment is affirmed.
Notes
. Section 19.1(b)(3) states:
The instrument shall analyze a reference sample, such as headspace gas from a mixture of water and a known weight of alcohol held at a constant temperature, the result of which must agree with the reference sample predict *901 ed value within +/— 0.01g/210L, or such limits as set by the Scientific Director.
