Alcohol Absorption
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DUI
Alcohol Absorption
- Absorption Rate
- BUI
- Challenging DUI Evidence
- DMV Hearings
- Driver's License Restoration
- DUI Penalties
- DUI with Injury
- Facing a DUI Conviction?
- Felony DUI
- First Time GUI
- Peak Alcohol Levels
- Unlawful Police Stops
- Underage DUI
- Vehicular Manslaughter
- Multiple Offense DUI
- Drug DUI
- Aggravated DUI
No Charges Aggravated Assault
ALLEGATION: Client arrested for drive-by shooting and was facing the possibility of a minimum mandatory 15 year prison sentence under Florida’s 10-20-Life Law. RESULT: After consulting with with prosecutors and law enforcement NO CHARGES WERE FILED.
Negotiated Plea DUI Manslaughter
ALLEGATION: Client charged with DUI Manslaughter. Client faced up to 15 years prison and a permanent loss of his drivers’ license. RESULT: Client entered negotiated plea to probation and is eligible to drive with a hardship license.
Not Convicted Sexual Battery
ALLEGATION: Client who holds a professional certification and license with the State of Florida was accused of Sexual Battery with the possibility of 15 years prison and mandatory “Sexual Offender” designation. Arrest was reported in the Panama City News Herald. RESULT: Charge reduced without consent of victim to simple battery (misdemeanor). Client NOT CONVICTED of any criminal offense and not designated a Sexual Offender. Client able to return to work without loss of professional certification and license
Client NOT CONVICTED Violation of Probation
ALLEGATION: Client violated probation for a second time by failing to report (“absconding”), committing a new crime of Battery, not completing DUI school and failing to complete court ordered community service hours.
Not Convicted Violation of Probation
ALLEGATION: Client violated probation by failing to report (“absconding”) and committing a new felony of Obtaining a Controlled Substance by Forgery. Client was on probation for 7 counts of Obtaining a Controlled Substance by Fraud, 6 counts of Forgery, and 6 counts of Criminal Use of Personal Identification.
Alcohol Absorption Factors
Why the Same Amount of Alcohol Produces a Different BAC in Every Person
Every DUI defendant is different. The same amount of alcohol produces a different BAC in different people — and a different BAC at different times in the same person, depending on what they ate, how quickly they drank, and dozens of other physiological variables. Understanding these factors is central to building an effective DUI defence.
Rusty Shepard has challenged breathalyser results and BAC testing in Bay County DUI cases for over 25 years. The factors below are not theoretical — they are the variables his team examines in every case to determine whether the test result accurately reflects the defendant’s actual BAC at the time of driving.
The Individual Factors That Affect Alcohol Absorption
1. Body Weight and Composition
Alcohol dissolves in body water, not body fat. Two people of the same weight but different body composition will have different BAC levels from the same alcohol consumption. A person with higher muscle mass (which contains more water) will have a lower BAC than a person with higher body fat from the same drinks. Standard BAC calculation tables do not account for individual body composition.
2. Gender
Women absorb alcohol more rapidly and reach higher peak BAC levels than men of comparable size and weight. This is because women have lower levels of gastric alcohol dehydrogenase — the enzyme that begins metabolising alcohol before it even reaches the bloodstream — and typically have a higher ratio of body fat to body water. The same number of drinks that would produce a 0.06% BAC in an average man might produce 0.08% or higher in an average woman.
3. Food Consumption
This is one of the most significant factors in absorption rate. Food in the stomach slows the passage of alcohol into the small intestine, where the majority of absorption occurs. A person who drank on a full stomach may have a substantially lower peak BAC — and a much slower rise to peak — than a person who drank on an empty stomach. The type of food matters too: high-fat, high-protein foods slow absorption significantly more than carbohydrates.
4. Rate and Timing of Consumption
Drinking the same amount of alcohol over four hours produces a very different BAC curve than drinking it over one hour. Rapid consumption produces a faster, higher peak. Slow consumption allows the liver to metabolise alcohol concurrently, resulting in a lower and delayed peak. The timing of when you stopped drinking relative to when you were driving is therefore central to the rising BAC defence.
5. Carbonation and Drink Concentration
Carbonated drinks — beers, wines, and spirits mixed with carbonated beverages — are absorbed more rapidly than non-carbonated drinks. Higher-concentration drinks (spirits vs. beer) can also produce faster absorption in some individuals. These factors affect the speed at which BAC rises and can affect the gap between drinking and peak absorption.
6. Tolerance
Regular drinkers develop metabolic tolerance — their livers process alcohol more efficiently. This does not reduce BAC, but it does affect how impaired they appear at a given BAC level. Someone with high tolerance may pass field sobriety tests at a BAC that would visibly impair a non-tolerant person. This distinction between BAC and actual impairment is relevant to both the absorption rate defence and the field sobriety test challenge.
Why These Factors Matter in Your Case
The Intoxilyzer 8000 measures alcohol concentration in breath. It does not measure impairment. It does not account for the individual factors above. It produces a number — and the prosecution uses that number as evidence that you were over the legal limit at the time of driving.
Rusty Shepard challenges that inference using expert toxicology analysis, the timeline of your specific case, and the individual factors most relevant to you. The question is not just whether the number on the machine is accurate — it is whether that number accurately represents your BAC at the time you were behind the wheel.
Facing DUI charges in Panama City or Bay County? Call Shepard Law at (850) 290-2505. Former prosecutor. Nationally Ranked DUI Attorney. Free consultation. Available 24/7.
DUI
Alcohol Absorption
- Absorption Rate
- BUI
- Challenging DUI Evidence
- DMV Hearings
- Driver's License Restoration
- DUI Penalties
- DUI with Injury
- Facing a DUI Conviction?
- Felony DUI
- First Time GUI
- Peak Alcohol Levels
- Unlawful Police Stops
- Underage DUI
- Vehicular Manslaughter
- Multiple Offense DUI
- Drug DUI
- Aggravated DUI
No Charges Aggravated Assault
ALLEGATION: Client arrested for drive-by shooting and was facing the possibility of a minimum mandatory 15 year prison sentence under Florida’s 10-20-Life Law. RESULT: After consulting with with prosecutors and law enforcement NO CHARGES WERE FILED.
Negotiated Plea DUI Manslaughter
ALLEGATION: Client charged with DUI Manslaughter. Client faced up to 15 years prison and a permanent loss of his drivers’ license. RESULT: Client entered negotiated plea to probation and is eligible to drive with a hardship license.
Not Convicted Sexual Battery
ALLEGATION: Client who holds a professional certification and license with the State of Florida was accused of Sexual Battery with the possibility of 15 years prison and mandatory “Sexual Offender” designation. Arrest was reported in the Panama City News Herald. RESULT: Charge reduced without consent of victim to simple battery (misdemeanor). Client NOT CONVICTED of any criminal offense and not designated a Sexual Offender. Client able to return to work without loss of professional certification and license
Client NOT CONVICTED Violation of Probation
ALLEGATION: Client violated probation for a second time by failing to report (“absconding”), committing a new crime of Battery, not completing DUI school and failing to complete court ordered community service hours.
Not Convicted Violation of Probation
ALLEGATION: Client violated probation by failing to report (“absconding”) and committing a new felony of Obtaining a Controlled Substance by Forgery. Client was on probation for 7 counts of Obtaining a Controlled Substance by Fraud, 6 counts of Forgery, and 6 counts of Criminal Use of Personal Identification.
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– Jessica
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– Vanessa M.
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– Craig E.
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