Office of the Attorney General
State of Texas


August 18, 1983

Honorable Bob Glasgow
Subcommittee on Criminal Matters
Texas State Senate
P. O. Box 12068, Capitol Station
Austin, Texas 78711

Opinion No. JM-68

Re: Constitutionality of Senate Bill No. 1 relating to per se definition of intoxication

Dear Senator Glasgow:

You have inquired about the constitutionality of the so-called per se intoxication rule contained in Senate Bill No. 1, the driving while intoxicated legislation recently enacted by the Sixty-eighth Legislature. Sections 3 and 4 of that act, amending, respectively, articles 67011-1 and 67011-5, V.T.C.S., contain provisions defining 'intoxicated' to include 'having an alcohol concentration of 0.10 percent or more.' We find that these provisions, which replace a presumption of intoxication derived from a finding of 0.10 alcohol concentration with a per se definition based on such a determination, are not constitutionally objectionable.

You have directed our attention to People v. Alfaro, 192 Cal. Rptr. 178, 182 (Cal. Ct. App. 1983), which held a comparable California statute to be unconstitutional, declaring it to be 'fatally vague in its notice provisions, and hence unenforceable.' However, in Burg v. Municipal Court, 192 Cal. Rptr. 531 (Cal. Ct. App. 1983), a coequal California judicial panel found that the same law 'is not vague and is therefore constitutional, valid, and enforceable.' Both California courts agreed that the applicable standard is the one stated in Connally v. General Construction Company, 269 U.S. 385, 391 (1926):

That the terms of a penal statute creating a new offense must be sufficiently explicit to inform those who are subject to it what conduct on their part will render them liable to its penalties is a well-recognized requirement, consonant alike with ordinary notations of fair paly and the settled rules of law. And a statute which either forbids or requires the doing of an act in terms so vague that men of common intelligence must necessarily guess at its meaning and differ as to its application, violates the first essential of due process of law.

The Alfaro court contended that the California per se intoxication statute

gives notice only that a particular percentage of alcohol in the blood of a driver is illegal, without further explication, notwithstanding that the measured concentration of alcohol in the blood at any given time is plainly not a matter of common understanding, as demonstrated by the fact that test results of clinically obtained specimens must be interpreted at trial by an expert witness.

Alfaro, supra, at 181. In its denial of rehearing, No. A019583 (Cal. Ct. App-- July 1, 1983) (not yet reported), the court concluded that

Vehicle Code section 23152, subdivision (b) [the California intoxication statute], is constitutionally defective because it fails to provide citizen- motorists with reasonable means of ascertaining and avoiding the conduct proscribed by the statute.

On the other hand, in Burg, supra, at 533, the court held that the statute in question 'conveys to the drinking driver a sufficiently definite warning of what conduct is proscribed.' As the dissent in Alfaro said:

Vehicle Code section 23152, subdivision (b), manifestly warns the drinking driver that he must discontinue, or at least temper, his drinking after his initial imbibition, lest he reach the forbidden blood alcohol driving level, and face arrest and prosecution. Such a warning is sufficient by any constitutional standard known to me.

Alfaro supra, at 183 (Elkington, J., dissenting). Hence, the central issue you raise is clearly drawn in the contrary positions taken by these California courts. Before we further examine the constitutionality of the new Texas definition of intoxication, we will describe the status of the existing presumption of intoxication based on a test finding of .10 percent alcohol concentration in a driving while intoxicated defendant.

It is well established in Texas

that the offense of 'driving an automobile upon a public highway while intoxicated' consists of two elements; intoxication and driving upon a highway in such condition. Snider v. State, 165 S.W.2d 904 (Tex. Cr. App. 1942). A criminal or unlawful intent is not an essential element of the offense. Joiner v. State, 161 Tex. Cr. App. 526, 279 S.W.2d 333 (1955).

Ex Parte Ross, 522 S.W.2d 214, 217-218 (Tex. Cr. App. 1975). See also Reed v. State, 624 S.W.2d 708 (Tex. App.--Houston [14th Dist.] 1981, no pet). Further, the Texas Court of Criminal Appeals has held that

[i]t is common knowledge that intoxication temporarily destroys faculties essential to safe driving, Schiller v. Rice, 151 Tex. 116, 246 S.W.2d 607 (1952), and we cannot in good conscience speculate that the Legislature failed to recognize that which human experience has shown. Examination of the definitions of 'intoxication' contained in the new Penal Code shows that the Legislature recognized that intoxication impairs mental faculties.

Ross, supra, at 218-219. Moreover, with regard to the existing presumption of intoxication, it is settled that

[s]uch a decision is legislative in nature and is foreclosed by the Legislature's judgment as reflected in article 67011-5.

Slagle v. State, 570 S.W.2d 916, 919 (Tex. Crim. App. 1978). 'Whether a particular blood alcohol level should carry the weight of a presumption is a matter for the Legislature.' Turpin v. State, 606 S.W.2d 907, 912 (Tex. Crim. App. 1980). Likewise, the Texas Court of Criminal Appeals has clearly stated the impact of such a presumption by noting 'that the jury may accept or reject the presumption of fact even in the face of no contrary evidence.' Madrid v. State, 595 S.W.2d 106, 110 (Tex. Crim. App.--1979). Specifically in the context of a driving while intoxicated prosecution, that court has noted:

A statutory presumption permits an inference to be drawn from proof of certain facts. In this instance the statute permits the jury to infer that a person is intoxicated if it is proved that there was 0.10 percent alcohol in his blood when he drove a motor vehicle on a public highway. The state is not relieved of the burden of proving each element of the offense beyond a reasonable doubt. In order to take advantage of the presumption the state must prove each fact giving rise to the presumption beyond a reasonable doubt.

Easdon v. State, 552 S.W.2d 153, 155 (Tex. Crim. App. 1977).

Your inquiry raises the issue of whether the conversion from a presumption of intoxication derived from .10 percent alcohol concentration to a per se definition of intoxication based on such a finding affects the validity of the regulatory scheme. In describing a virtually identical statutory change, one court has recently written:

Under the prior DWI statute . . . the amount of alcohol in a person's blood created certain presumptions as to whether or not a person was under the influence of intoxicants. Under the present statutory scheme, however, the presumptions have been abolished. Instead, the statute sets out alternate methods of committing the crime of driving while under the influence. The statute does not presume, it defines. Thus, driving with a 0.1 percent BAC is one method of committing the crime of driving while under the influence. (Emphasis added).

State v. Franco, 639 P.2d 1320, 1323 (Wash. 1982). As in prior Texas cases regarding driving while intoxicated, courts in other states dealing with per se intoxication laws have noted that

[i]t is well enough known to require no elaboration that driving while under the influence of liquor is so hazardous that it involves the public interest and welfare, and consequently, is a proper subject for regulation and control by law . . ..

Greaves v. State, 528 P.2d 805, 807 (Utah 1974). See also Roberts v. State, 329 So.2d 296, 297 (Fla. 1976). More specifically, one court has noted that

there is an abundance of scientific support to indicate that with a BAC level of 0.1 percent, all persons are significantly affected. At that level, all persons will have lost one quarter of their normal driving ability, some persons will have lost as much as one half of their normal driving ability and a few people will not be able to even sit up in the driver's seat . . . 'the amount of alcoholic beverages necessary to produce a blood alcohol level of 0.1% is considerable and is believed by most people to represent abusive and excessive acute consumption of alcohol . . . most people who drink alcoholic beverages will recognize that the consumption of more than 8 to 9 'drinks' (that is, a half pint of whiskey, or one and one-half six packs of beer, or a quart of natural wine) in two or three hours will produce subjective effects and impaired physical performance. Yet, it is the consumption of approximately this amount of beverage that is required to produce a blood alcohol of 0.1% in the average adult.'

Franco, supra, at 1322. Just as under existing Texas law, likewise it has been held in another state that a per se prohibition.

represents a legislative determination that such quantity of alcohol has sufficient adverse effect upon any person to make his driving a definite hazard to himself and others. We cannot say that this determination is unfounded or contrary to the facts; a number of studies and many statistics have recently been published by experts in this field which support that conclusion.

Coxe v. State, 281 A.2d 606, 607 (Del. 1971). Moreover, just as in the existing Texas DWI cases, other state courts considering per se intoxication laws similar to Texas' new statute have held that there are two elements to the offense--the requisite alcohol concentration and concurrent operation of a motor vehicle. Coxe, supra, at 607; Greaves, supra, at 807-808.

In addition to the elemental similarities, courts have found that the legislative determination that intoxication is definitively established by a finding of .10 percent alcohol concentration does not improperly alter the state's burden any more than the presumption did:

The breath sample must be analyzed, the machine must be proved to be in proper working order beyond a reasonable doubt by the State, the officer who gives the test must be certified and must be proved to be competent at trial. The ampules must be proved beyond a reasonable doubt at trial to have been properly tested and the State always has the burden of proving beyond a reasonable doubt to the jury that the 0.1 percent reading was a correct one. The defense has the same opportunity to attack that reading as they always have had under the prior presumptions. The defense is entitled to an expert witness instruction . . .. Additional expert testimony, while available to the defendant, is not the only method of impeaching the reading on the breathalyzer. The State's expert testimony may be controverted by the defendant testifying about the number of drinks he consumed and the effects of the alcohol upon him, he may call lay witnesses to testify as to those same factors, he may argue that the machine must be in error because of the slight effect the alcohol had upon him. It is simply not the case that the giving of the breath sample proves the crime.

Franco, supra, at 1326-1327.

We conclude that the Alfaro decision, which went against the weight of existing authority throughout the nation, misapplied the vagueness test. As both the Burg court, at 533, and the Alfaro dissent, at 183, recognized:

'[T]he Constitution does not require impossible standards'; and all that is required is that the language 'conveys sufficiently definite warning as to the proscribed conduct when measured by common understanding and practices . . .. That there may be marginal cases in which it is difficult to determine the side of the line on which a particular fact situation falls is no sufficient reason to hold the language too ambiguous to define a criminal offense.' (Citations omitted).

Roth v. United States, 354 U.S. 476, 491-492 (1957). Thus, we believe that Texas courts will confirm the analysis in the Alfaro dissent:

With near universality it has been authoritatively declared that a drinking driver who has ingested so much alcohol, as to have developed a blood alcohol content of 0.10 percent, has, for the public's and his own safety, been rendered unfit for further driving . . .. By any test of reason and experience he has, and knows he has, imbibed a large quantity of alcohol before he reaches the proscribed 0.10 percent blood alcohol limit.

. . . .

Under these criteria, a drinking driver is patently warned by the statute that his drinking must stop, before he has ingested the forbidden quantity.

Alfaro, supra, at 183 (Elkington, J., dissenting).


The per se definition of intoxication in Senate Bill No. 1 is constitutional.

      Very truly yours,

      Mattox signature

      Jim Mattox
      Attorney General of Texas

      Tom Green
      First Assistant Attorney General

      David R. Richards
      Executive Assistant Attorney General

      Prepared by Colin Carl
      Assistant Attorney General

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