Morgan County Sheriff Department
Indiana DUI OWI Laws and BAC limits
DUI is more commonly known as OWI (operating
while intoxicated) in Indiana.
ALL DRIVERS - BAC
LIMIT = 0.08%
In the State of Indiana it is crime for ANY driver to
drive with a BAC (blood alcohol content -
concentration) of 0.08% and above.
COMMERCIAL DRIVERS - BAC LIMIT = 0.04%
It is a crime for commercial vehicle
operators to drive with a BAC (blood alcohol content -
concentration) of 0.04% or above.
MINOR (under the age of 21)
- BAC LIMIT = 0.01%
It is a crime for persons
under 21 years of age to drive with a BAC (blood
alcohol content - concentration) of 0.01% or above.
It is an offense to refuse to submit to a chemical
test in Indiana and "Implied Consent
Laws" are enforced.
Use this calculator to instantly compute your estimated
blood/breath alcohol concentration.
Keep in mind the results generated are estimates.
The primary purpose is to provide information about the
responsible use of alcohol.
Instructions: Please select weight, drinks consumed, time period
and gender and click the "compute your BAC" button.
Note: I developed this BAC calculator in 10 pound increments, you can use the closest weight shown, but to be on the safe side choose the next lower closest weight. Drinks consumed can be a beer, a glass of wine or a mixed drink. For the most part, a glass of wine (5-ounce glass), a bottle or can of beer (12-ounce), and a shot of whiskey or other distilled spirits (1/2 ounce of 80 proof distilled spirits (either straight or in a mixed drink), all contain equivalent amounts of alcohol and are the same to a Breathalyzer.
Alcohol equivalence is an important fact to know. Alcohol is alcohol, and a drink is a drink.
Itís not what people drink but how much they drink that
This BAC calculator is
enabled to work.
This calculator may not work with some older
There are so many variables and factors that can affect a specific individuals BAC level at any given time that the only failsafe and reliable way to calculate an individuals blood alcohol level at a precise moment in time is by blood analysis or a reliable and approved breathalyzer. This BAC calculator provides reliable estimates based on average biological values and scientific research and should be used for educational, research and information purposes only. If in doubt, use common sense and do not drive.
What is Bac - Blood Alcohol Content?
Blood alcohol content is a measure of the amount of alcohol
present in a certain amount of blood. It is usually described as the amount
in mg per 100ml of blood. The prescribed legal drunk driving
limit in Indiana is 80mg/100ml blood or 0.08%.
!! CAUTION - Driving Ability Impaired !!
You can be prosecuted in Indiana
without driving while you are over the legal prescribed bac limit.
Under Indiana law, it is unlawful to drive with a BAC limit above the
per se laws OR to drive while impaired under the influence of alcohol
Under this law the officer must show that the driver was IMPAIRED
by alcohol and/or drugs. The level of impairment is usually based on
observations and evidence of driving ability (or rather inability),
physical appearance, field sobriety tests and any other relevant evidence which
can help prove a persons driving ability was indeed impaired. Different amounts
of alcohol can affect people in different ways, what may impair one persons
driving ability and make them feel drunk, might not necessarily impair another
persons driving ability.
Observations from a law enforcement officer that may lead to being stopped
and arrested include:
Making a turn too widely or narrowly
Using two lanes, straddling the center line
Almost hitting someone or something
Weaving or drifting from one side of the road to another
Driving too slowly and being overly cautious
Driving too close to vehicle in front
Driving ON the center lines
Swerving to correct course of vehicle
You can be charged with an offence regardless of your BAC
level, as long as impairment can be proved to the legal extent necessary.
FACTORS THAT AFFECT YOUR BAC - Blood Alcohol Content
Numerous factors can affect an individuals BAC, these include:
The amount of alcohol a person consumes, the more they
drink, the higher their BAC will become
The speed at which a person consumes alcohol, the faster a
person drinks, the faster their BAC will rise
A persons gender. Alcohol is highly water soluble and a
persons BAC is directly proportional to their total body water content. Females
generally have less water in their bodies than males, this means that a female
who drinks exactly the same amount of alcohol as a male, in the same space of
time, will generally have a higher BAC.
A persons weight. The more a person weighs generally means
the more water they will have in their bodies, meaning any alcohol ingested will
produce a lower alcohol to blood ratio than that of a person weighing less. This
is because the alcohol is "spread out" more "thinly".
A persons fat/muscle content. Fatty tissue does not absorb
alcohol very well, alcohol will be absorbed a lot more into other tissues which
are rich in water such as muscle. If two people weighing 198 lbs., one a tall thin
person and the other a small fat person consumed the same amount of alcohol, the
small fat person would have a higher BAC than the tall thin person.
A persons metabolism (the rate at which alcohol is
processed and eliminated by the body). This can vary from person to person,
however, the average person will eliminate 15ml of alcohol per hour. Heavy
drinkers may have more active livers and can therefore eliminate more alcohol
than average. People with liver disease may have less active livers and will
therefore eliminate alcohol slower.
Medication and the amount of food in the
stomach can also have an effect on the rate at which alcohol is absorbed into
the body and subsequently eliminated. Younger people also tend to metabolize
alcohol more quickly than older people.
EFFECTS ON DRIVING SKILLS
- Some loss of judgment
- Slight body warmth
- Altered mood
- Decline in visual functions (rapid tracking of a moving target)
- Decline in ability to perform two tasks at the same time (divided
- Exaggerated behavior
- May have loss of small muscle control (focusing of eyes etc)
- Impaired judgment
- Lowered alertness
- Inhibitions become lowered
- Reduced co-ordination
- Reduced ability to track moving objects
- Increased difficulty in steering
- Rapid response to emergency driving situations reduced
- Muscle co-ordination is reduced further reduced (balance, speech,
vision, reaction times are all reduced)
- Judgment, self control, reasoning and memory are impaired
- Increased difficulty in detecting danger
- Difficulty concentrating
- Short term memory loss
- Speed control is affected
- Reduced information processing ability (signal detection, visual search,
- Impaired perception of surroundings
- Obvious deterioration of reaction times and self control
- Slurred speech, poor co-ordination, slowed thinking, lowered
- Visibly impaired
- Reduced ability to maintain lane position (difficulty steering)
- Reaction times greatly reduced
- False sense of control
- Overall ability to control vehicle and react to surroundings greatly reduced
- Muscle control greatly reduced
- Vomiting may occur (unless a tolerance for alcohol has been built up
over time or a person has reached this alcohol level slowly)
- Major loss of balance and co-ordination
- Substantial impairment of overall vehicle control (reaction times, speed
control, visual, auditory and information processing greatly reduced)
REMEMBER THE ONLY SAFE DRIVING LIMIT IS "0"
IF YOU INTEND TO DRINK - STAY SAFE AND DON'T
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