DWI (in the Texas Penal Code) is the offense for driver's 21 and older, DUI (in the Texas Beverage Code) is the offense for driver's under 21 IN TEXAS,
different states use different terminology. However, the word DRUNK is not in the penal code. Nor is BUZZ, it is exactly as stated previously, impairment, whether or not driver is aware of it. By your prior misunderstanding you implied that DUI is not as serious. Actually the opposite is true a minor (under 21 for alcohol) is DUI with ANY ALCOHOL consumption PERIOD! Does NOT even require impairment. Please don't quote what you don't understand. Try sticking to theology and leave legal advice to those licensed to render it.
Following is from the Texas Penal Code word for word unedited:
§ 49.01. DEFINITIONS. In this chapter:
(1) "Alcohol concentration" means the number of grams
of alcohol per:
(A) 210 liters of breath;
(B) 100 milliliters of blood; or
(C) 67 milliliters of urine.
(2) "Intoxicated" means:
(A) not having the normal use of mental or
physical faculties by reason of the introduction of alcohol, a
controlled substance, a drug, a dangerous drug, a combination of
two or more of those substances, or any other substance into the
body; or
(B) having an alcohol concentration of 0.08 or
more.
§ 49.04. DRIVING WHILE INTOXICATED. (a) A person commits
an offense if the person is intoxicated while operating a motor
vehicle in a public place.
(b) Except as provided by Subsection (c) and Section 49.09,
an offense under this section is a Class B misdemeanor, with a
minimum term of confinement of 72 hours.
(c) If it is shown on the trial of an offense under this
section that at the time of the offense the person operating the
motor vehicle had an open container of alcohol in the person's
immediate possession, the offense is a Class B misdemeanor, with a
minimum term of confinement of six days.
Texas Alcoholic Beverage Code, Sec. 106.041 provides that a minor commits this offense if he operates a motor vehicle in a public place
while having any detectable amount of alcohol in his system.
This offense is a Class C misdemeanor punished by a fine not to exceed $500.00. However, if a minor has 2 prior convictions, the punishment is a fine of not less than $500.00 or more than $2,000.00 and/or confinement in jail for a term not to exceed 6 months!